date:20100412

Dropbox has an RPM for Fedora Core 9 (x86). I am running CentOS 5.4 on
my Desktop, which I believe is based on Fedora Core 6.  Are the
libraries Fedora Core 9 uses substantially different than those CentOS
5.4 uses?  If Dropbox had an SRPM available, I would Download that and
Rebuild, but I'm sure it is Proprietary and they won't release an SRPM
to me.  TIA!
Lanny
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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?

2010-04-12 Thread Joseph L. Casale

 but I'm sure it is Proprietary and they won't release an SRPM
to me.
nautilus-dropbox is glp'ed, the source is right below that rpm you downloaded.
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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?

2010-04-12 Thread Geerd-Dietger Hoffmann

Hey

On Mon, Apr 12, 2010 at 2:21 PM, Lanny Marcus lmmailingli...@gmail.com wrote:
 Dropbox has an RPM for Fedora Core 9 (x86). I am running CentOS 5.4 on
 my Desktop, which I believe is based on Fedora Core 6.  Are the
 libraries Fedora Core 9 uses substantially different than those CentOS
 5.4 uses?  If Dropbox had an SRPM available, I would Download that and
 Rebuild, but I'm sure it is Proprietary and they won't release an SRPM
 to me.  TIA!

I remember trying to build dropbox for CentOS and there was a problem
with lib dependencies. What happens when you install the rpm? Does it
work? I believe to remember that it had to do something with nauilus.
I am probably wrong.

Would be interested if that worked.

Cheers Didi

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Re: [CentOS] rsyslog 4.x or 5.x version for Centos 5.4

2010-04-12 Thread Jim Perrin

On Mon, Apr 12, 2010 at 7:01 AM, f...@ll for...@stalowka.info wrote:
 I was looking for centos 5.4 package rsyslog version 5.x or 4.x as rpm.
 Any repo exist with this package?

In 5.5, rsyslog will be rebased to 3.x. If you really need a 4.x
version, the IUS community repository has it packaged.



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Re: [CentOS] everything seems to hang, but system is idle? [SOLVED]

2010-04-12 Thread Rudi Ahlers

On Mon, Apr 12, 2010 at 1:50 PM, JohnS jse...@gmail.com wrote:

 On Sun, 2010-04-11 at 15:48 +0200, Rudi Ahlers wrote:

 Yes, I think it could be a problematic iscsi config. Now that I think
 of it, the server wasn't rebooted in about 2 or 3 months and I did
 some iscsi testing a while ago, but with a recent power outage it
 could have enabled / a faulty configuration, I just rebooted the
 server again, managed to the remove iscsi this time, and will see if
 this solves the problem.
 ---

 Well along with that I would do a file system check.  Then if it keeps
 on stop just the nmbd service and not smbd for cifs sharing.

 John

 ___


So far everything seems to be fine, apart from my Cobbler problem (see
other thread). rsync has been running very well for the past few hours
(have been deleting  restoring a lot of stuff to check ) so it was
probably the improper iscsi mount that was giving issues.

Thanx for all the help  :)


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Rudi Ahlers
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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?

2010-04-12 Thread William Hooper

On Mon, Apr 12, 2010 at 9:21 AM, Lanny Marcus lmmailingli...@gmail.com wrote:
 Dropbox has an RPM for Fedora Core 9 (x86). I am running CentOS 5.4 on
 my Desktop, which I believe is based on Fedora Core 6.  Are the
 libraries Fedora Core 9 uses substantially different than those CentOS
 5.4 uses?  If Dropbox had an SRPM available, I would Download that and
 Rebuild, but I'm sure it is Proprietary and they won't release an SRPM
 to me.  TIA!
 Lanny

I'm successfully using Dropbox on couple of CentOS 5.4 machines, but
in a headless configuration.  I followed the instructions on the
Dropbox Wiki[1].  I concur with Joseph that it looks like the RPM is
just the Nautilus plugin.  Since I don't use that I'm not sure how
compatible it is with CentOS.

[1] http://wiki.dropbox.com/TipsAndTricks/TextBasedLinuxInstall


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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?

On Mon, Apr 12, 2010 at 8:21 AM, Lanny Marcus lmmailingli...@gmail.com wrote:
 Dropbox has an RPM for Fedora Core 9 (x86). I am running CentOS 5.4 on
 my Desktop, which I believe is based on Fedora Core 6.  Are the
snip
3 very quick replies already! Thanks to each of you!  I am going to
Update my Desktop completely, before I try to get Dropbox to work.
Steve, please let me know, when you have the RPM ready. Joseph, I will
look for the nautilus-dropbox on the Dropbox web site. Didi, stay
tuned  I'm a complete novice at this, but I have the Dev tools on
my Desktop and will give it a try.
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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?

On Mon, Apr 12, 2010 at 10:00 AM, William Hooper whooper...@gmail.com wrote:
 On Mon, Apr 12, 2010 at 9:21 AM, Lanny Marcus lmmailingli...@gmail.com 
 wrote:
 Dropbox has an RPM for Fedora Core 9 (x86). I am running CentOS 5.4 on
 my Desktop, which I believe is based on Fedora Core 6.  Are the
snip
 I'm successfully using Dropbox on couple of CentOS 5.4 machines, but
 in a headless configuration.  I followed the instructions on the
 Dropbox Wiki[1].  I concur with Joseph that it looks like the RPM is
 just the Nautilus plugin.  Since I don't use that I'm not sure how
 compatible it is with CentOS.

 [1] http://wiki.dropbox.com/TipsAndTricks/TextBasedLinuxInstall

William: Thank you for that.  I would prefer to do this via RPM, since
it is frowned upon not to, but if necessary, I can go that route.  Our
IPCop box is headless, but not my Desktop.  :-)   As per my 2nd post
in this thread, I am going to completely update my Desktop, before
trying to get Dropbox to work. Lanny
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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?

2010-04-12 Thread William Hooper

On Mon, Apr 12, 2010 at 11:10 AM, Lanny Marcus lmmailingli...@gmail.com wrote:
 William: Thank you for that.  I would prefer to do this via RPM, since
 it is frowned upon not to, but if necessary, I can go that route.

I don't think it matters how you install the nautilus plugin, you
still will be getting the proprietary Dropbox daemon bits separately
(the daemon downloads from the website the first time you run the
plugin).

  Our
 IPCop box is headless, but not my Desktop.  :-)   As per my 2nd post
 in this thread, I am going to completely update my Desktop, before
 trying to get Dropbox to work. Lanny

The box I use Dropbox headless on is a catch-all server, not my
desktop.  I guess if push comes to shove you can install Dropbox
headless and use the dbcli.py to check the status instead of using the
GUI.

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Re: [CentOS] Installing a .ko file?

2010-04-12 Thread Slack-Moehrle

Hi Benjamin,

 I am trying to add a 3Ware 9500S-8 RAID controller to a CentOS 5.4 box. 

 I have the drivers from 3Ware and they seem to be a .ko file (which I 
 presume is like a .kext on OSX)

Have you tried it without installing the vendor driver? That board 
should be old enough to be supported natively. I use 9550SX boards 
without any problems.

Can you tell me the process you take? I dont see drives available, I believe 
they are being exported to the OS though. I took my 8x1.5tb drives, went into 
the card setup and set each one as a single drive and when the machine boots, 
the card says they are exported.

What can I try to ensure that CentOS is seeing them?

-Jason
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[CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Niki Kovacs

Hi,

The language lab from the local university has contacted me. They'd like 
to have a low-cost file server for storing all their language video 
files. They have a mix of Windows, Mac OS X and even Linux clients, 
roughly 50 machines. The files are quite big, and they calculated a 
total amount of 2 To of storage.

I'm not very proficient with hardware, meaning either I'm dealing with 
remote servers in some datacenter, or otherwise I install CentOS 
desktops on any hardware people throw at me.

Since the aim is lowcost, would it be wrong to install that fileserver 
on a no-name desktop PC with a 64bit processor and enough RAM, and then 
simply put 2 x 2 To hard disks in it, either with a mirroring RAID (can 
never remember which does what in 0, 1 and 5) or some rsync script 
regularly copying over the first disk to the second? Or do you have 
something more apt to suggest?

Cheers from South France,

Niki
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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Tim Nelson

- Niki Kovacs cont...@kikinovak.net wrote:
 Hi,
 
 The language lab from the local university has contacted me. They'd
 like 
 to have a low-cost file server for storing all their language video 
 files. They have a mix of Windows, Mac OS X and even Linux clients, 
 roughly 50 machines. The files are quite big, and they calculated a 
 total amount of 2 To of storage.

2 TB?

 
 I'm not very proficient with hardware, meaning either I'm dealing with
 
 remote servers in some datacenter, or otherwise I install CentOS 
 desktops on any hardware people throw at me.
 
 Since the aim is lowcost, would it be wrong to install that fileserver
 
 on a no-name desktop PC with a 64bit processor and enough RAM, and
 then 

You *COULD* do this, but keep in mind desktop class hardware may give you 
poorer performance, especially for fileserver use. You seem to have the storage 
requirements down, but make no mention of performance requirements. They are 
moving huge files to/from the server, but are they expecting it to happen in a 
few minutes or take all day? You mention 50 machines, but how many *CONCURRENT* 
connections? The more concurrent sessions you have, the poorer it may perform 
due to disk thrashing. A *GOOD* storage controller added to a desktop class 
machine on a PCIe bus will do wonders for you.

 simply put 2 x 2 To hard disks in it, either with a mirroring RAID
 (can 
 never remember which does what in 0, 1 and 5) or some rsync script 
 regularly copying over the first disk to the second? Or do you have 

For mirroring, you'll want RAID-1. This automatically keeps both 
drives/partitions in sync as the data is transferred, no need for rsync or any 
external scripting other than checking the health of your array(s).

 something more apt to suggest?

I'd suggest something more 'yum' like than 'apt'. [1]

 
 Cheers from South France,
 
 Niki

Cheers from North Central U.S., 

Tim

[1] A poor attempt at package manager humor. RHEL/CentOS 'yum' vs Debian/Ubuntu 
'apt'. :-)
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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread rainer

 Hi,

 The language lab from the local university has contacted me. They'd like
 to have a low-cost file server for storing all their language video
 files. They have a mix of Windows, Mac OS X and even Linux clients,
 roughly 50 machines. The files are quite big, and they calculated a
 total amount of 2 To of storage.

 I'm not very proficient with hardware, meaning either I'm dealing with
 remote servers in some datacenter, or otherwise I install CentOS
 desktops on any hardware people throw at me.

 Since the aim is lowcost, would it be wrong to install that fileserver
 on a no-name desktop PC with a 64bit processor and enough RAM, and then
 simply put 2 x 2 To hard disks in it, either with a mirroring RAID (can
 never remember which does what in 0, 1 and 5) or some rsync script
 regularly copying over the first disk to the second? Or do you have
 something more apt to suggest?



What value does the language lab associate to these files?
And how is backup done?



Rainer
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Re: [CentOS] Installing a .ko file?

2010-04-12 Thread John Doe

From: Slack-Moehrle mailingli...@mailnewsrss.com
 Can you tell me the process you take? I 
 dont see drives available, I believe they are being exported to the OS 
 though. I 
 took my 8x1.5tb drives, went into the card setup and set each one as a single 
 drive and when the machine boots, the card says they are exported.

Look maybe at SCSI_3W_9XXX In '/usr/src/kernels/.../drivers/scsi/Kconfig'
But they mention a '3w-9xxx.c' that is not there...

JD


  
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Re: [CentOS] Performance problems with XFS on Centos 5.4

2010-04-12 Thread Bernhard Gschaider


 On Fri, 9 Apr 2010 10:59:02 -0400
 RW == Ross Walker rswwal...@gmail.com wrote:

RW On Apr 9, 2010, at 9:59 AM, Bernhard Gschaider
RW bgschaid_li...@ice-
sf.at wrote:

 Hi!
 
 During the last weeks I experienced some performance problems
 with a large file-system on XFS basis. Sometimes for instance
 ls is painfully. Immidiatly afterwards ls on the same directory
 is immidiate. I used strace on this ls and found that during
 the first ls the lstat-calls need approx 0.02s each while
 during the second ls the are two orders of magnitude faster.
 
 Googling around I stumbled upon some messages similar like this
 
 http://www.opensubscriber.com/message/linux-...@oss.sgi.com/1355060.html
 
 which have in common a) they're from around 2006 b) they
 suggest to increase a mount-option ihashsize. This mount option
 is listed as deprecated in the current kernel-doc
 
 So my question: does anyone have experience with that kind of
 performance problem? Do you think it is a XFS problem or are
 there some other tuning parameters in the kernel that could be
 modified for instance via /proc?
 
 The reason why I'm asking here is that it is a production
 file-system so I would be very unpopular if I experiment too
 much (a couple of reboots is OK ;) )
 
 Bernhard
 
 PS: the situation got worse during the last weeks when the
 file-system increased in size, so the option that some kind of
 buffer now is too small and I'm experiencing some kind of
 thrashing seems very likely to me

RW Are you defragging the file system regularly?

Uups. Never occured to me (Fragmentation is s Windoze)
Had a look:

xfs_db frag
actual 6349355, ideal 4865683, fragmentation factor 23.37%

This seems significant.

RW How much memory do you have in the system and how big is the
RW file system?

Memory on the system is 4Gig (2 DualCore Xenons). The filesystem is
3.5 TB of which 740 Gig are used. Which is the maximum amount used
during the one year that the filesystem is being used (that is why the
high fragmentation amazes me)

RW What are the XFS parameters for the file system?

Is this sufficent?

% xfs_info  /raid
meta-data=/dev/VolGroup00/LogVol05 isize=256agcount=32, agsize=29434880 blks
 =   sectsz=512   attr=0
data =   bsize=4096   blocks=941916160, imaxpct=25
 =   sunit=0  swidth=0 blks, unwritten=1
naming   =version 2  bsize=4096  
log  =internal   bsize=4096   blocks=32768, version=1
 =   sectsz=512   sunit=0 blks, lazy-count=0
realtime =none   extsz=4096   blocks=0, rtextents=0


RW What is the storage setup?

The filesystem is on a LVM-Volume which sits on a RAID 5 (Hardware
RAID) drive

RW Need the info.

So the way to go forward would be using xfs_fsr on that drive. I read
some horror stories about lost files, are these to be taken seriously
(I mean they were in some Ubuntu forums ;) )

Any other thoughts on parameters?

Thanks for your time

Bernhard
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[CentOS] Amazon S3FS Automounter of sorts

2010-04-12 Thread Matt Keating


Hi,

I¹ve just started using Amazon S3 for storage and have used s3fs to mount
the buckets on the file system.
1. I was wondering if anyone has a better method  even though this meets my
current needs. 
2. if there is an automounter that could be tweaked to work with s3fs. The
entries in my fstab are rather different to the normal disk based ones,
s3fs#BUCKETNAME /mnt/s3/BUCKETNAME fuse
allow_other,default_acl=public-read,noauto 0 0 ,so I wasn¹t sure if it is
possible.

My reasoning to want an automounter is I¹m not sure on the amount of extra
calls made to the S3, so would prefer it not be connected if its not needed.

Thanks,
Matt



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Re: [CentOS] Amazon S3FS Automounter of sorts

2010-04-12 Thread Geerd-Dietger Hoffmann

Hey

On Mon, Apr 12, 2010 at 5:24 PM, Matt Keating matt_keat...@dennis.co.uk wrote:
 I’ve just started using Amazon S3 for storage and have used s3fs to mount
 the buckets on the file system.

What type of storage are you using it for. Web-app, Map/Reduce stuff,
File-backup, etc ...

 I was wondering if anyone has a better method – even though this meets my
 current needs.

Why do you want to use s3 like a file system? s3 does not have the
properties of a posix system so you are bound be get some minor errors
and problems.

 if there is an automounter that could be tweaked to work with s3fs. The
 entries in my fstab are rather different to the normal disk based ones,

    s3fs#BUCKETNAME /mnt/s3/BUCKETNAME fuse
 allow_other,default_acl=public-read,noauto 0 0 ,so I wasn’t sure if it is
 possible.

I hope you are aware that everything you put on your s3 is publicly
available if someone knows your bucket name.

I use s3tools to transfer data between s3 and a folder on my machine.

I tried mounting it like you, but just ran into too many problems,
especially if you access files from many machines.

Maybe a little more information on your use-case :)

Cheers Didi

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Re: [CentOS] Installing a .ko file?

2010-04-12 Thread Benjamin Franz

Slack-Moehrle wrote:
 Hi Benjamin,


   
 Have you tried it without installing the vendor driver? That board 
 should be old enough to be supported natively. I use 9550SX boards 
 without any problems.
 

 Can you tell me the process you take? I dont see drives available, I believe 
 they are being exported to the OS though. I took my 8x1.5tb drives, went into 
 the card setup and set each one as a single drive and when the machine boots, 
 the card says they are exported.

 What can I try to ensure that CentOS is seeing them?
   
If you are using the current CentOS (make sure that you are using 5.4 
with the current kernel - it probably is not enough to be using bare 
un-updated 5.0 or some such old version) just type

 fdisk -l /dev/sda

which should give you something similar to this:

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

changing '/dev/sda' to sdb through sdh or whatever is appropriate to 
your system to check each exported drive.

-- 
Benjamin Franz

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Re: [CentOS] Amazon S3FS Automounter of sorts

2010-04-12 Thread Matt Keating

Thanks for the quick reply,

 What type of storage are you using it for. Web-app, Map/Reduce stuff,
 File-backup, etc ...
 
Currently using it for serving files through cloudfront - so purely as a
storage space for CDN delivery.

 Why do you want to use s3 like a file system? s3 does not have the
 properties of a posix system so you are bound be get some minor errors
 and problems.

I found it works well with FTPing into the server and uploading to the
mounted bucket. 
Reason its like this is that there are lots of different people who upload
throughout our company. It was much easier giving out the FTP details, which
were totally under our control (Username/Pass,Firewall,etc), rather than
giving out the S3 logins.

 I hope you are aware that everything you put on your s3 is publicly
 available if someone knows your bucket name.

Yes, I am aware of that - its all being served on the net anyway.
If I remove the Pubic read only, will the files still be accessible via
cloudfront?

 I use s3tools to transfer data between s3 and a folder on my machine.
 
 I tried mounting it like you, but just ran into too many problems,
 especially if you access files from many machines.
 
What issues did you run into? As I haven't had any problems as of yet.

MattNOTE: The information in this email is confidential and may be legally
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Any opinions or comments are personal to the writer and do not represent the
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not a named addressee, please contact itdirec...@dennis.co.uk immediately by 
reply email and then delete this message from your system. Please do not copy 
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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Gé Weijers


50 simultaneous users will require more than a bargain desktop PC.

I would go for low-end server hardware, which will get you ECC memory and 
more SATA ports. The cost is probably not significantly more than a _good_ 
quality desktop system.


You may want to allow for some expansion, 2 To may grow into 3 To over 
time. Also plan for backups. You may want to use LVM and leave some disk 
space unallocated to you can create snapshots and make backups to external 
USB drives or another network server while the system is up and running.


My personal criteria:
- decent power supply
- space for 4 3.5 hard drives.
- 4 memory slots, so I can go to 8 Go memory without breaking the bank
- at least a dual-core Xeon or AMD processor which supports ECC memory
- 4 or more available SATA ports on the motherboard
- 1-2 1000BASE-T network interfaces.

You could go for a RAID controller, but RAID1 (mirroring) has little 
overhead in software, and you can buy 2 extra hard disks for the price of 
the controller.


Gé (from cloudy Nevada)


On Mon, 12 Apr 2010, Niki Kovacs wrote:


Hi,

The language lab from the local university has contacted me. They'd like
to have a low-cost file server for storing all their language video
files. They have a mix of Windows, Mac OS X and even Linux clients,
roughly 50 machines. The files are quite big, and they calculated a
total amount of 2 To of storage.

I'm not very proficient with hardware, meaning either I'm dealing with
remote servers in some datacenter, or otherwise I install CentOS
desktops on any hardware people throw at me.

Since the aim is lowcost, would it be wrong to install that fileserver
on a no-name desktop PC with a 64bit processor and enough RAM, and then
simply put 2 x 2 To hard disks in it, either with a mirroring RAID (can
never remember which does what in 0, 1 and 5) or some rsync script
regularly copying over the first disk to the second? Or do you have
something more apt to suggest?

Cheers from South France,

Niki
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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Timo Schoeler

thus On 04/12/2010 06:50 PM, Gé Weijers spake:

 50 simultaneous users will require more than a bargain desktop PC.

Please don't top post...

Yes -- 50 not too lazy users will kill the machine.

 I would go for low-end server hardware, which will get you ECC memory
 and more SATA ports. The cost is probably not significantly more than a
 _good_ quality desktop system.

ECC is mandatory in decent machines, be it workstations or servers, IMHO.

Think of a faulty stick of RAM you don't discover immediately, it might 
shred all your Terabytes of data.

 You may want to allow for some expansion, 2 To may grow into 3 To over
 time. Also plan for backups. You may want to use LVM and leave some disk
 space unallocated to you can create snapshots and make backups to
 external USB drives or another network server while the system is up and
 running.

 My personal criteria:
 - decent power supply
 - space for 4 3.5 hard drives.
 - 4 memory slots, so I can go to 8 Go memory without breaking the bank
 - at least a dual-core Xeon or AMD processor which supports ECC memory

Almost every not too crappy mother board will allow ECC using an AMD CPU 
(Phenom et al). To get ECC in intel space, you'll have to pay *much* more.

 - 4 or more available SATA ports on the motherboard
 - 1-2 1000BASE-T network interfaces.

Maybe, search for a (used) server on eBay or elsewhere. You can get very 
decent machines with all the features or more (ECC, many memory slots, 
dual, redundant power supplies, even out-of-band management) at a very 
low price. Keep in mind that those machines *are* loud. (You have a 
closet/rack to keep it, don't you?)

 You could go for a RAID controller, but RAID1 (mirroring) has little
 overhead in software, and you can buy 2 extra hard disks for the price
 of the controller.

Maybe for future growth you'll want to keep in mind that you could go 
RAID6. RAID5 is evil, taking todays hard drive sizes in mind (speaking 
of 2TiByte drives, especially).

 Gé (from cloudy Nevada)

HTH,

Timo (from sunny Berlin)

 On Mon, 12 Apr 2010, Niki Kovacs wrote:

 Hi,

 The language lab from the local university has contacted me. They'd like
 to have a low-cost file server for storing all their language video
 files. They have a mix of Windows, Mac OS X and even Linux clients,
 roughly 50 machines. The files are quite big, and they calculated a
 total amount of 2 To of storage.

 I'm not very proficient with hardware, meaning either I'm dealing with
 remote servers in some datacenter, or otherwise I install CentOS
 desktops on any hardware people throw at me.

 Since the aim is lowcost, would it be wrong to install that fileserver
 on a no-name desktop PC with a 64bit processor and enough RAM, and then
 simply put 2 x 2 To hard disks in it, either with a mirroring RAID (can
 never remember which does what in 0, 1 and 5) or some rsync script
 regularly copying over the first disk to the second? Or do you have
 something more apt to suggest?

 Cheers from South France,

 Niki

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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Rob Kampen





Gé Weijers wrote:
50 simultaneous users will require more than a bargain
desktop PC.
  
  
I would go for low-end server hardware, which will get you ECC memory
and more SATA ports. The cost is probably not significantly more than a
_good_ quality desktop system.
  
  
You may want to allow for some expansion, 2 To may grow into 3 To over
time. Also plan for backups. You may want to use LVM and leave some
disk space unallocated to you can create snapshots and make backups to
external USB drives or another network server while the system is up
and running.
  
  
My personal criteria:
  
- decent power supply
  
- space for 4 3.5" hard drives.
  
- 4 memory slots, so I can go to 8 Go memory without breaking the bank
  
- at least a dual-core Xeon or AMD processor which supports ECC memory
  
- 4 or more available SATA ports on the motherboard
  
- 1-2 1000BASE-T network interfaces.
  
  
You could go for a RAID controller, but RAID1 (mirroring) has little
overhead in software, and you can buy 2 extra hard disks for the price
of the controller.
  

I'd support the above hardware as a minimum - it appears most will be
reading, thus software RAID1 will work just fine - If there are many
different files, I'd go for more smaller disks - say 8 by 500G in
RAID1, thus the ability to spread the files over more spindles as this
may become the bottleneck if all the files are on a single 2T drive.

Gé (from cloudy Nevada)
  
  
  
On Mon, 12 Apr 2010, Niki Kovacs wrote:
  
  
  Hi,


The language lab from the local university has contacted me. They'd
like

to have a low-cost file server for storing all their language video

files. They have a mix of Windows, Mac OS X and even Linux clients,

roughly 50 machines. The files are quite big, and they calculated a

total amount of 2 To of storage.


I'm not very proficient with hardware, meaning either I'm dealing with

remote servers in some datacenter, or otherwise I install CentOS

desktops on any hardware people throw at me.


Since the aim is lowcost, would it be wrong to install that fileserver

on a no-name desktop PC with a 64bit processor and enough RAM, and then

simply put 2 x 2 To hard disks in it, either with a mirroring RAID (can

never remember which does what in 0, 1 and 5) or some rsync script

regularly copying over the first disk to the second? Or do you have

something more apt to suggest?


Cheers from South France,


Niki

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[CentOS] mysterious weekly shutdown

I have a Centos 5.4 machine that has, for the past two weeks, apparently
been shut off over the weekend.  It's just sitting there turned off on
Monday morning and when someone hits the power switch it comes right
back on and everything works again.

This happened last weekend, and again over this past weekend.

Here is /var/log/messages from shortly before it apparently shut down
this weekend.  Can anyone tell me what is or might be going on?

Apr 10 11:01:27 answeringmachine vgetty[6012]: message keep,
length=00:00:20, name='', caller=none, dev=ttyACM0, pid=6012
Apr 10 11:19:10 answeringmachine vgetty[6095]: message keep,
length=00:00:24, name='', caller=none, dev=ttyACM0, pid=6095
Apr 10 11:43:56 answeringmachine vgetty[6134]: message keep,
length=00:00:11, name='', caller=none, dev=ttyACM0, pid=6134
Apr 10 12:22:34 answeringmachine mgetty[6029]: fax dev=ttyS1, pid=6029,
caller='none', name='', id='', +FHNG=074, pages=0/0, time=00:00:51 
Apr 10 12:43:49 answeringmachine gconfd (freeads-3524): Exiting
Apr 10 12:43:49 answeringmachine gdm[2872]: Master halting...
Apr 10 12:43:49 answeringmachine pcscd: winscard.c:304:SCardConnect()
Reader E-Gate 0 0 Not Found
Apr 10 12:43:50 answeringmachine shutdown[2872]: shutting down for
system halt
Apr 10 12:43:50 answeringmachine mgetty[6262]: failed dev=ttyS1,
pid=6262, got signal 15, exiting
Apr 10 12:43:50 answeringmachine mgetty[2874]: failed dev=ttyS2,
pid=2874, got signal 15, exiting
Apr 10 12:43:50 answeringmachine vgetty[2877]: failed dev=ttyACM1,
pid=2877, got signal 15, exiting
Apr 10 12:43:50 answeringmachine vgetty[6183]: failed dev=ttyACM0,
pid=6183, got signal 15, exiting
Apr 10 12:43:51 answeringmachine smartd[2854]: smartd received signal
15: Terminated 
Apr 10 12:43:51 answeringmachine smartd[2854]: smartd is exiting (exit
status 0) 
Apr 10 12:43:52 answeringmachine avahi-daemon[2769]: Got SIGTERM,
quitting.
Apr 10 12:43:52 answeringmachine avahi-daemon[2769]: Leaving mDNS
multicast group on interface eth0.IPv6 with address
fe80::21c:c0ff:fee3:f1b1.
Apr 10 12:43:52 answeringmachine avahi-daemon[2769]: Leaving mDNS
multicast group on interface eth0.IPv4 with address 192.168.0.6.
Apr 10 12:43:52 answeringmachine mountd[2588]: Caught signal 15,
un-registering and exiting.
Apr 10 12:43:52 answeringmachine kernel: nfsd: last server has exited
Apr 10 12:43:52 answeringmachine kernel: nfsd: unexporting all
filesystems
Apr 10 12:43:57 answeringmachine ntpd[2532]: ntpd exiting on signal 15
Apr 10 12:43:57 answeringmachine nm-system-settings: disconnected from
the system bus, exiting.
Apr 10 12:43:57 answeringmachine kernel: nm-system-setti[3083]: segfault
at  rip  rsp 7fffb3916778 error 14
Apr 10 12:43:57 answeringmachine rpc.statd[2349]: Caught signal 15,
un-registering and exiting.
Apr 10 12:43:57 answeringmachine auditd[2264]: The audit daemon is
exiting.
Apr 10 12:43:57 answeringmachine kernel: audit(1270925037.732:154):
audit_pid=0 old=2264 by auid=4294967295
Apr 10 12:43:57 answeringmachine pcscd: pcscdaemon.c:572:signal_trap()
Preparing for suicide
Apr 10 12:43:58 answeringmachine pcscd:
hotplug_libusb.c:376:HPRescanUsbBus() Hotplug stopped
Apr 10 12:43:58 answeringmachine pcscd:
readerfactory.c:1379:RFCleanupReaders() entering cleaning function
Apr 10 12:43:58 answeringmachine pcscd: pcscdaemon.c:532:at_exit()
cleaning /var/run
Apr 10 12:43:59 answeringmachine kernel: Kernel logging (proc) stopped.
Apr 10 12:43:59 answeringmachine kernel: Kernel log daemon terminating.
Apr 10 12:44:00 answeringmachine exiting on signal 15
-- 
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Re: [CentOS] mysterious weekly shutdown

2010-04-12 Thread Kwan Lowe

On Mon, Apr 12, 2010 at 1:08 PM, Frank Cox thea...@sasktel.net wrote:
 I have a Centos 5.4 machine that has, for the past two weeks, apparently
 been shut off over the weekend.  It's just sitting there turned off on
 Monday morning and when someone hits the power switch it comes right
 back on and everything works again.

 This happened last weekend, and again over this past weekend.

 Here is /var/log/messages from shortly before it apparently shut down
 this weekend.  Can anyone tell me what is or might be going on?


 Apr 10 12:43:59 answeringmachine kernel: Kernel logging (proc) stopped.
 Apr 10 12:43:59 answeringmachine kernel: Kernel log daemon terminating.
 Apr 10 12:44:00 answeringmachine exiting on signal 15
 --

I've seen this on some HP Blades that I administer. I ended up
disabling the pcsd daemon. It might have been related to a dynamically
attached optical device that was moved from blade to blade, but I
didn't spend much time troubleshooting.  Since disabling pcsd a few
months ago it has been solid.
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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?


Ge' wrote:
 thus On 04/12/2010 06:50 PM, Gé Weijers spake:

 I would go for low-end server hardware, which will get you ECC memory
 and more SATA ports. The cost is probably not significantly more than a
 _good_ quality desktop system.
snip
Also consider hot-swappable disk enclosures, either in the server or
external. When one dies, assuming you have a spare available, it'll will
make your users much happier, since you can replace the drive without
taking the server down.

   mark


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Re: [CentOS] everything seems to hang, but system is idle? [SOLVED]

2010-04-12 Thread Ross Walker

On Apr 12, 2010, at 10:25 AM, Rudi Ahlers rudiahl...@gmail.com wrote:

 On Mon, Apr 12, 2010 at 1:50 PM, JohnS jse...@gmail.com wrote:

 On Sun, 2010-04-11 at 15:48 +0200, Rudi Ahlers wrote:

 Yes, I think it could be a problematic iscsi config. Now that I  
 think
 of it, the server wasn't rebooted in about 2 or 3 months and I did
 some iscsi testing a while ago, but with a recent power outage it
 could have enabled / a faulty configuration, I just rebooted the
 server again, managed to the remove iscsi this time, and will see if
 this solves the problem.
 ---

 Well along with that I would do a file system check.  Then if it  
 keeps
 on stop just the nmbd service and not smbd for cifs sharing.

 John

 ___


 So far everything seems to be fine, apart from my Cobbler problem (see
 other thread). rsync has been running very well for the past few hours
 (have been deleting  restoring a lot of stuff to check ) so it was
 probably the improper iscsi mount that was giving issues.

 Thanx for all the help  :)

Don't mount a page cached iSCSI target over loopback or you'll  
deadlock the page cache. Sounds like what happened.

-Ross

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Re: [CentOS] mysterious weekly shutdown

Frank wrote:

 I have a Centos 5.4 machine that has, for the past two weeks, apparently
 been shut off over the weekend.  It's just sitting there turned off on
 Monday morning and when someone hits the power switch it comes right
 back on and everything works again.

 This happened last weekend, and again over this past weekend.

 Here is /var/log/messages from shortly before it apparently shut down
 this weekend.  Can anyone tell me what is or might be going on?

 Apr 10 11:01:27 answeringmachine vgetty[6012]: message keep,
 length=00:00:20, name='', caller=none, dev=ttyACM0, pid=6012
 Apr 10 11:19:10 answeringmachine vgetty[6095]: message keep,
 length=00:00:24, name='', caller=none, dev=ttyACM0, pid=6095
 Apr 10 11:43:56 answeringmachine vgetty[6134]: message keep,
 length=00:00:11, name='', caller=none, dev=ttyACM0, pid=6134
 Apr 10 12:22:34 answeringmachine mgetty[6029]: fax dev=ttyS1, pid=6029,
 caller='none', name='', id='', +FHNG=074, pages=0/0, time=00:00:51
 Apr 10 12:43:49 answeringmachine gconfd (freeads-3524): Exiting

This - I wonder if someone's somehow getting in. Anything in
/var/log/secure for 12:43?

 Apr 10 12:43:49 answeringmachine gdm[2872]: Master halting...
 Apr 10 12:43:49 answeringmachine pcscd: winscard.c:304:SCardConnect()
 Reader E-Gate 0 0 Not Found
 Apr 10 12:43:50 answeringmachine shutdown[2872]: shutting down for
 system halt

Here's a thought: does it have bluetooth enabled? Is it in range to talk
to someone *else's* bluetooth keyboard? Is anyone near enough to shut down
their machine, and/or accidentally yours?
snip
 status 0)
 Apr 10 12:43:52 answeringmachine avahi-daemon[2769]: Got SIGTERM,
 quitting.

Is this machine hardwired? If so, you do NOT need the avahi-daemon, on by
default, which is intended for a clueless home user to set up a network.
Turn it *off*, and yank the firewall rule that allows it.
snip

   mark

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Re: [CentOS] mysterious weekly shutdown


On Mon, 2010-04-12 at 13:19 -0400, m.r...@5-cent.us wrote:
 This - I wonder if someone's somehow getting in. Anything in
 /var/log/secure for 12:43?

Apr  9 18:13:46 answeringmachine gdm[2965]: pam_unix(gdm:session):
session opened for user freeads by (uid=0)
Apr 10 12:43:49 answeringmachine gdm[2965]: pam_unix(gdm:session):
session closed for user freeads
Apr 10 12:43:53 answeringmachine sshd[2516]: Received signal 15;
terminating.
Apr 10 12:43:53 answeringmachine runuser: pam_unix(runuser:session):
session opened for user frankcox by (uid=0)
Apr 10 12:43:53 answeringmachine runuser: pam_unix(runuser:session):
session closed for user frankcox
Apr 12 09:53:49 answeringmachine sshd[2518]: Server listening on :: port
22.

 Here's a thought: does it have bluetooth enabled? Is it in range to
 talk
 to someone *else's* bluetooth keyboard? Is anyone near enough to shut
 down
 their machine, and/or accidentally yours?

There is no bluetooth or wireless anything on this, other than a
wireless mouse.  Everything else is hard-wired.

 Is this machine hardwired? If so, you do NOT need the avahi-daemon, on
 by
 default, which is intended for a clueless home user to set up a
 network.
 Turn it *off*, and yank the firewall rule that allows it.

Interesting.  I never realized (or thought about) that. I shall do a
bunch of turning-off of avahi-daemon on these machines.
-- 
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Re: [CentOS] mysterious weekly shutdown

Frank wrote:

 On Mon, 2010-04-12 at 13:19 -0400, m.r...@5-cent.us wrote:
 This - I wonder if someone's somehow getting in. Anything in
 /var/log/secure for 12:43?

 Apr  9 18:13:46 answeringmachine gdm[2965]: pam_unix(gdm:session):
 session opened for user freeads by (uid=0)
 Apr 10 12:43:49 answeringmachine gdm[2965]: pam_unix(gdm:session):
 session closed for user freeads
 Apr 10 12:43:53 answeringmachine sshd[2516]: Received signal 15;
 terminating.
 Apr 10 12:43:53 answeringmachine runuser: pam_unix(runuser:session):
 session opened for user frankcox by (uid=0)
 Apr 10 12:43:53 answeringmachine runuser: pam_unix(runuser:session):
 session closed for user frankcox

*This, I don't understand. Either freeads or frankcox shut the system
down, it looks like to me. Could your account have been compromised?

 Apr 12 09:53:49 answeringmachine sshd[2518]: Server listening on :: port
 22.

 Here's a thought: does it have bluetooth enabled? Is it in range to
 talk to someone *else's* bluetooth keyboard? Is anyone near enough to
 shut down their machine, and/or accidentally yours?

 There is no bluetooth or wireless anything on this, other than a
 wireless mouse.  Everything else is hard-wired.

 Is this machine hardwired? If so, you do NOT need the avahi-daemon, on
 by default, which is intended for a clueless home user to set up a
 network. Turn it *off*, and yank the firewall rule that allows it.

 Interesting.  I never realized (or thought about) that. I shall do a
 bunch of turning-off of avahi-daemon on these machines.

Yes. Turn them *all* off. Actually, in a server room, you could having
other, obscure problems, as wireless tries to connect.

  mark

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Re: [CentOS] mysterious weekly shutdown


On Mon, 2010-04-12 at 13:11 -0400, Kwan Lowe wrote:
 Since disabling pcsd a few
 months ago it has been solid.

Interesting.  Since there is no particular reason why pcsd needs to be
running on this machine, I just disabled it.

I'll see what happens now.
-- 
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Re: [CentOS] mysterious weekly shutdown

2010-04-12 Thread Jussi Hirvi

Is the machine connected to an UPS?

Maybe the UPS either sends a shutdown signal, or maybe it just breaks 
the powerfeed periodically because an old battery / overload (ours did 
once), and the machine cannot restart itself after that.

- Jussi Hirvi


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Topeliuksenkatu 15 C * 00250 Helsinki * Finland
Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms)
jussi.hi...@greenspot.fi * http://www.greenspot.fi
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Re: [CentOS] mysterious weekly shutdown


On Mon, 2010-04-12 at 13:43 -0400, m.r...@5-cent.us wrote:
 *This, I don't understand. Either freeads or frankcox shut the system
 down, it looks like to me. Could your account have been compromised?

I'm starting to wonder about freeads, actually.  That account is
generally left logged-in from the main office and I wonder who might
have been in the office on Saturday.  I'm going to do some
investigation.

frankcox is my vnc session on that machine.

That machine doesn't talk to the outside world directly; you have to go
through another one first.  And the other one is acting fine.
-- 
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Re: [CentOS] mysterious weekly shutdown


On Mon, 2010-04-12 at 20:56 +0300, Jussi Hirvi wrote:
 Is the machine connected to an UPS?
 
 Maybe the UPS either sends a shutdown signal, or maybe it just breaks 
 the powerfeed periodically because an old battery / overload (ours
 did 
 once), and the machine cannot restart itself after that.

That was, in fact, my first thought.  I changed that UPS just a couple
of weeks ago; it's brand new.  I also don't have that UPS hooked up to
the computer with the data cable, so if it did drop the power it
shouldn't go thorough the shutdown sequence but would immediately drop
dead.
-- 
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[CentOS] how long NTP sync to time server on CENTOS 4.X????

2010-04-12 Thread mcclnx mcc

We have several CENTOS 4 and 5 servers.  ALL CENTOS servers have NTP setup to 
sync time server.  Several days ago due to power outage all servers are reboot. 
 Due to DNS server did NOT up quickly, CENTOS servers start up and can NOT find 
time server.

For CENTOS 5.X servers, it did quickly resync to time server after 30 minutes.

For CENTOS 4.X servers, it have been 3 days still NOT sync to time server.  I 
know I can run service ntpd restart to force server sync to time server, but 
I like to know how long it take for CENTOS 4.X automatic resync to time server.

Thanks. 


  
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[CentOS] How long will CENTOS 4.X automatic resync to to time server???

2010-04-12 Thread mcclnx mcc

We have several CENTOS 4 and 5 servers.  ALL CENTOS servers have NTP setup to 
sync time server.  Several days ago due to power outage all servers are reboot. 
 Due to DNS server did NOT up quickly, CENTOS servers start up and can NOT find 
time server.

For CENTOS 5.X servers, it did quickly resync to time server after 30 minutes.

For CENTOS 4.X servers, it have been 3 days still NOT sync to time server.  I 
know I can run service ntpd restart to force server sync to time server, but 
I like to know how long it take for CENTOS 4.X automatic resync to time server.

Thanks. 


  
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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Gé Weijers




On Mon, 12 Apr 2010, Rob Kampen wrote:


Gé Weijers wrote:
I'd support the above hardware as a minimum - it appears most will be 

reading, thus software RAID1

will work just fine - If there are many different files, I'd go for more 
smaller disks - say 8 by
500G in RAID1, thus the ability to spread the files over more spindles as this 
may become the
bottleneck if all the files are on a single 2T drive.


Using 8 drives is going to significantly increase the cost, because you'd 
need 8 SATA interfaces and 8 drive bays. Otherwise I agree. A RAID-10 
setup (striped mirrors) will probably give the best performance.


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Re: [CentOS] mysterious weekly shutdown


 On Mon, 2010-04-12 at 13:43 -0400, m.r...@5-cent.us wrote:
 *This, I don't understand. Either freeads or frankcox shut the system
 down, it looks like to me. Could your account have been compromised?

 I'm starting to wonder about freeads, actually.  That account is
 generally left logged-in from the main office and I wonder who might
 have been in the office on Saturday.  I'm going to do some
 investigation.

Does the machine that that account is logged on from fire up a
screen-locking screen saver after some reasonable amount of inactivity
(like 20 min or so?)

 frankcox is my vnc session on that machine.

Guessed that.

 That machine doesn't talk to the outside world directly; you have to go
 through another one first.  And the other one is acting fine.

So something is happening on this machine.

  mark

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Re: [CentOS] how long NTP sync to time server on CENTOS 4.X????

 We have several CENTOS 4 and 5 servers.  ALL CENTOS servers have NTP setup
 to sync time server.  Several days ago due to power outage all servers are
 reboot.  Due to DNS server did NOT up quickly, CENTOS servers start up and
 can NOT find time server.

 For CENTOS 5.X servers, it did quickly resync to time server after 30
 minutes.

 For CENTOS 4.X servers, it have been 3 days still NOT sync to time server.
  I know I can run service ntpd restart to force server sync to time
 server, but I like to know how long it take for CENTOS 4.X automatic
 resync to time server.

man ntpd:
excerpt:
 Most operating systems and hardware of today incorporate a time-of-year
(TOY) chip  to  maintain  the  time  during periods when the power is
off. When the machine is booted, the chip is used to initialize the
operating system  time. After the machine has synchronized to a NTP
server, the operating system corrects the chip from time to time. In case
there is no TOY chip or for some reason  its  time is more than 1000s
from the server time, ntpd assumes something must be terribly wrong and
the only reliable action is for the operator to intervene and set the
clock by hand.
--- end excerpt ---

  mark

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Re: [CentOS] mysterious weekly shutdown


On Mon, 2010-04-12 at 14:46 -0400, m.r...@5-cent.us wrote:
 
 Does the machine that that account is logged on from fire up a
 screen-locking screen saver after some reasonable amount of inactivity
 (like 20 min or so?)

No, it just sits there doing nothing forever until someone sits down in
front of it.

 So something is happening on this machine.

Apparently.  I have just been looking at the log from the previous
weekend when it shut down before.

Here is what /var/log/messages has to say from April 2.  Once again the
pscd line is right at the top of the log immediately after the shutdown
signal.  I don't know if that's suggestive, or just a coincidence.

Apr  2 09:12:43 answeringmachine vgetty[22949]: message keep,
length=00:01:02, name='', caller=none, dev=ttyACM0, pid=22949
Apr  2 09:23:20 answeringmachine vgetty[22963]: message keep,
length=00:00:25, name='', caller=none, dev=ttyACM0, pid=22963
Apr  2 09:43:56 answeringmachine gdm[2880]: Master halting...
Apr  2 09:43:56 answeringmachine shutdown[2880]: shutting down for
system halt
Apr  2 09:43:57 answeringmachine pcscd: winscard.c:304:SCardConnect()
Reader E-Gate 0 0 Not Found
Apr  2 09:43:57 answeringmachine mgetty[2884]: failed dev=ttyS2,
pid=2884, got signal 15, exiting

and so on through the rest of the shutdown.

 
-- 
MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com

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[CentOS] 'p' in boot selector going into single-user

2010-04-12 Thread ken


On boot, when I hit the F12 key to bring up the boot menu, the screen
displays the various kernels and other boot options.  In the text below
this menu it says I can hit 'p' to bring up a menu with other options.
I've done this with the last two boot-ups and no other menu or options
appear.  Is something missing?  (I also tried Alt-p, Shift-p, Ctrl-p and
a few other keys and there's no change onscreen.)


I'd like to know also how to select single user mode, but haven't found
a way to do that.

Thanks much.

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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread John R Pierce

Niki Kovacs wrote:
Hi,

The language lab from the local university has contacted me. They'd like
to have a low-cost file server for storing all their language video
files. They have a mix of Windows, Mac OS X and even Linux clients,
roughly 50 machines. The files are quite big, and they calculated a
total amount of 2 To of storage.

I'd look at using 1TB drives rather than 2TB, the 2TB seem to be too
bleeding edge and have been too many anecdotal reports of problems. for
sure you want to use server rated SATA drives for an application like
this, such as the WDC RE series, or the Seagate ES series (this has more
to do with write buffering and consistent error reporting than it does
to do with performance).

if this system is going to have 50 clients constantly playing videos on
it, then I'd look at 450gb or 600gb SAS drives, and a lot more of them.

If this is to be a rack mounted system in a data center, I'd probably
look at a box like a HP DL370, which can hold quite a lot of drives.
http://h10010.www1.hp.com/wwpc/us/en/sm/WF05a/15351-15351-3328412-241644-241475-3890172.html

put the lowest end single CPU they offer in it, but get the better raid
controller and a reasonable amount of memory, and redundant PSU. get 2
hot spare drives. if initial requirements are 2TB usable storage,
thats 4 x 1TB raid10 plus 2 x 1TB spares. also get two small drives
(like 72gb sas) for those left-side slots, mirrored for the OS and
software. 6gb ram is probably fine. the base model of this system is
$3300 with a 4-core 2.4ghz, 6gb ram and 4 gigE ethernet ports (you could
gang these to the switch if their network infrastructure supports ether
bonding aka ipmp).

OSX should be happy with NFS, Linux clients certainly are, and Samba can
serve files for Windows clients.

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Re: [CentOS] mysterious weekly shutdown


 On Mon, 2010-04-12 at 14:46 -0400, m.r...@5-cent.us wrote:

 Does the machine that that account is logged on from fire up a
 screen-locking screen saver after some reasonable amount of inactivity
 (like 20 min or so?)

 No, it just sits there doing nothing forever until someone sits down in
 front of it.

That shouldn't be left that way. Those who use it should have their own
accounts.

Hell, I know I'm paranoid, but a sysadmin, as a friend (also a sysadmin)
likes to say, he's being paid to be professionally paranoid. I log off my
own system, at home, every night, and every morning before I head off to
work.

 So something is happening on this machine.

 Apparently.  I have just been looking at the log from the previous
 weekend when it shut down before.

 Here is what /var/log/messages has to say from April 2.  Once again the
 pscd line is right at the top of the log immediately after the shutdown
 signal.  I don't know if that's suggestive, or just a coincidence.

I think the latter, unless you've got SmartCards that you use for
security. (Yes, some here have them; they haven't given me one yet, but
it's coming - oh, yes, I'm a contractor with the US federal gov't.)

 Apr  2 09:12:43 answeringmachine vgetty[22949]: message keep,
 length=00:01:02, name='', caller=none, dev=ttyACM0, pid=22949
 Apr  2 09:23:20 answeringmachine vgetty[22963]: message keep,
 length=00:00:25, name='', caller=none, dev=ttyACM0, pid=22963
 Apr  2 09:43:56 answeringmachine gdm[2880]: Master halting...
 Apr  2 09:43:56 answeringmachine shutdown[2880]: shutting down for
 system halt

Something's happening at 09:43:56. Don't suppose there's any other logs
with that timestamp?
snip
mark

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Re: [CentOS] 'p' in boot selector going into single-user


 On boot, when I hit the F12 key to bring up the boot menu, the screen
 displays the various kernels and other boot options.  In the text below
 this menu it says I can hit 'p' to bring up a menu with other options.
 I've done this with the last two boot-ups and no other menu or options
 appear.  Is something missing?  (I also tried Alt-p, Shift-p, Ctrl-p and
 a few other keys and there's no change onscreen.)


 I'd like to know also how to select single user mode, but haven't found
 a way to do that.

When you get to the grub menu, hit 'e' at the kernel, then arrow down one
to the line beginning with kernel, and hit 'e' again. At the end of the
line, add the letter s, then follow the directions for getting out of edit
mode, and hit the letter b for boot.

   mark

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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread Simon Billis

John R Pierce sent a missive on 2010-04-12:

 Niki Kovacs wrote:
 Hi,
 
 The language lab from the local university has contacted me. They'd
 like to have a low-cost file server for storing all their language
 video files. They have a mix of Windows, Mac OS X and even Linux
 clients, roughly 50 machines. The files are quite big, and they
 calculated a total amount of 2 To of storage.
 
 
 I'd look at using 1TB drives rather than 2TB, the 2TB seem to be too
 bleeding edge and have been too many anecdotal reports of problems.
 for sure you want to use server rated SATA drives for an application
 like this, such as the WDC RE series, or the Seagate ES series (this
 has more to do with write buffering and consistent error reporting
 than it does to do with performance).

There are some array providers that are currently using 2TB drives (rorke
data for one) - but I would always suggest that you use enterprise quality
disks.


 
 if this system is going to have 50 clients constantly playing videos
 on it, then I'd look at 450gb or 600gb SAS drives, and a lot more of them.

I would look at the performance of the disk subsystem, make sure that the
sustained read of the system is able to keep up with the demands of
streaming video - you'll need to have 10K of 15K rpm disks for realtime
video if you're streaming to a lot of users. It may be that their
expectations are that the video isn't realtime and therefore you will be
able to use slower disks and subsystem.


 
 If this is to be a rack mounted system in a data center, I'd probably
 look at a box like a HP DL370, which can hold quite a lot of drives.
 http://h10010.www1.hp.com/wwpc/us/en/sm/WF05a/15351-15351-3328412-
 241644-241475-3890172.html

Depending on the number of disks you need (the IO profile will determine the
speed/size/interface) you may have to go to an external array.


 
 put the lowest end single CPU they offer in it, but get the better raid
 controller and a reasonable amount of memory, and redundant PSU.   get 2
 hot spare drives.   if initial requirements are 2TB usable storage,
 thats 4 x 1TB raid10 plus 2 x 1TB spares.  also get two small drives
 (like 72gb sas) for those left-side slots, mirrored for the OS and
 software.   6gb ram is probably fine.   the base model of this system is
 $3300 with a 4-core 2.4ghz, 6gb ram and 4 gigE ethernet ports (you could
 gang these to the switch if their network infrastructure supports ether
 bonding aka ipmp).
 
If it's only files that your sharing then this is fine, but if you intend to
change the video quality on the fly then you may need to have something
beefier... but the disk subsystem is the key to fast file/video streaming.


 OSX should be happy with NFS, Linux clients certainly are, and Samba
 can serve files for Windows clients.

You may also be looking at http web services with flash encoding or
quicktime - Apple used to have a free version of their quicktime video
streaming platform which may work for you.

Good luck with this, if it is as you suggest in your post just a file store
and not a video streamer platform, then your life is simple. As soon as you
enter the world of video streaming, life becomes harder and more expensive.

Simon.



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Re: [CentOS] Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?

2010-04-12 Thread John R Pierce

Simon Billis wrote:
 John R Pierce sent a missive on 2010-04-12:
   
 if this system is going to have 50 clients constantly playing videos
 on it, then I'd look at 450gb or 600gb SAS drives, and a lot more of them.
 

 I would look at the performance of the disk subsystem, make sure that the
 sustained read of the system is able to keep up with the demands of
 streaming video - you'll need to have 10K of 15K rpm disks for realtime
 video if you're streaming to a lot of users. It may be that their
 expectations are that the video isn't realtime and therefore you will be
 able to use slower disks and subsystem.
   

as he said it was a language lab, I'd expect at peak times, all 50 
clients could be busy playing different videos.   so, this disk system 
has to be able to keep up with 50 different streams for extended periods 
of time, which is a more complex workload than one faster stream.   I'm 
going to hazard a guess that most streaming video is under 1MByte/sec 
but with 50 x 1Mbyte/sec playing at once, this becomes a more random 
access workload than 1 x 50MB/sec...  

Also, there's a strong likelihood these language videos are somewhat 
random access, and there will be a lot of seeking back and forth, 
playing short snippets.   Server-side and client-side caching will help 
a lot on this but the requirement could well still be there.   Response 
time is fairly important here, if a user chooses to jump to a given 
chapter, it should be accessible in less than 1 second or something.   
frequent youtube style 5-10 second pauses for 'buffering' will result in 
a lot of student frustration.





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Re: [CentOS] OT: Dropbox - Fedora Core 9 RPM will work on CentOS 5.4?