date:20131204

Hey,
(sorry for cross-posting, you will find this message also in centos-virt, 
maybe, but this was not intended and a mistake)

I have a system with a mdraid 1

...
md1 : active raid1 sdb2[1] sda2[0]
 1465031488 blocks [2/2] [UU]
...

this raid partition has a lvm physical volume with one volume group and several 
logical volumes. This machine is running since years and I seldom touch the lvm 
config. The lvm commands are giving me strange warnings I am uncomfortable with

...
# pvdisplay 
 Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2 not 
/dev/md1
 --- Physical volume ---
 PV Name   /dev/sda2
 VG Name   vg_sys
 PV Size   1.36 TB / not usable 6.81 MB
 Allocatable   yes 
 PE Size (KByte)   32768
 Total PE  44709
 Free PE   17701
 Allocated PE  27008
 PV UUID   b79x0k-LXR9-mAC0-z0IZ-UxyJ-G1VC-24Crl7
...

What does this Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using 
/dev/sda2 not /dev/md1 message?
Some logical volumes are virtual disks vor kvm guests. Are these guests using 
sda only and not the mdraid?

-- 
Markus
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Re: [CentOS] SOHO colour laser printer recommendations

From: Ned Slider n...@unixmail.co.uk

 I'd really appreciate some recommendations for colour laser printers for 
 use with CentOS. It's for light home use with CentOS 5 and CentOS 6 systems.
 Must have:
 1. Colour. Quality not that important as mainly for kids school project 
 type of stuff.
 2. Ethernet connectivity - want something I can plug into the network
 3. Cheap running costs - don't want to be spending a fortune on toner
 4. Linux support

We bought an Epson c2800n for 200€ (after a 100€ discount) in 2008 and it is 
still working like a charm...
But I have no idea how the new models fare.
The only downside for an home user is the huge size of the thing.

JD
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Re: [CentOS] Found duplicate PV

2013-12-04 Thread Nux!

On 04.12.2013 13:43, Markus Falb wrote:
 
 What does this Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7:
 using /dev/sda2 not /dev/md1 message?
 Some logical volumes are virtual disks vor kvm guests. Are these
 guests using sda only and not the mdraid?

Markus,

I see /etc/lvm/lvm.conf has an option to ignore md members and seems on 
by default in EL6:
md_component_detection = 1

If you run pvdisplay /dev/sda2 what does it show? Normally you should 
get a Failed to read physical volume /dev/sda2.

Do you have such thing in your /etc/lvm/lvm.conf? ADditionally you can 
force a filter on the drives, smth like:
filter = [r|/dev/sda2]
(make sure you delete /etc/lvm/cache/.cache and regenerate it with 
vgscan so as not to contain old stuff)



-- 
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro
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Re: [CentOS] ZFS on Linux testing effort

From: Lists li...@benjamindsmith.com

 Our next big test is to try out ZFS filesystem send/receive in lieu of 
 our current backup processes based on rsync. Rsync is a fabulous tool, 
 but is beginning to show performance/scalability issues dealing with the 
 many millions of files being backed up, and we're hoping that ZFS 
 filesystem replication solves this.

Not sure if I already mentioned it but maybe have a look at:
 http://code.google.com/p/lsyncd/

JD
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Re: [CentOS] Found duplicate PV

Markus Falb wrote:
 Hey,
 (sorry for cross-posting, you will find this message also in centos-virt,
 maybe, but this was not intended and a mistake)

 I have a system with a mdraid 1

 ...
 md1 : active raid1 sdb2[1] sda2[0]
  1465031488 blocks [2/2] [UU]
 ...

 this raid partition has a lvm physical volume with one volume group and
 several logical volumes. This machine is running since years and I seldom
 touch the lvm config. The lvm commands are giving me strange warnings I am
 uncomfortable with

 ...
 # pvdisplay
  Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2 not
 /dev/md1
  --- Physical volume ---
  PV Name   /dev/sda2
  VG Name   vg_sys
  PV Size   1.36 TB / not usable 6.81 MB
snip
smartctl -t short
to start. And is there anything in your logfiles saying something like 
Device: /dev/sdb [SAT], 98 Currently unreadable (pending) sectors?

   mark, who's working at decommissioning that server the line's
from...

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Re: [CentOS] ZFS on Linux testing effort

2013-12-04 Thread Nux!

On 04.12.2013 14:05, John Doe wrote:
 From: Lists li...@benjamindsmith.com
 
 Our next big test is to try out ZFS filesystem send/receive in lieu 
 of
 our current backup processes based on rsync. Rsync is a fabulous 
 tool,
 but is beginning to show performance/scalability issues dealing with 
 the
 many millions of files being backed up, and we're hoping that ZFS
 filesystem replication solves this.
 
 Not sure if I already mentioned it but maybe have a look at:
  http://code.google.com/p/lsyncd/

I'm not so sure inotify works well with millions of files, not to 
mention it uses rsync. :D

-- 
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Nux!
www.nux.ro
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[CentOS] driver disk in kickstart...

Hi,

I need to add a driver in my usb install key kickstart to handle some crap hp 
fake raid.
The thing is the driverdisk option offers partition or some network options.

I would like to put everything on the key, so no network.
Does partition mean it is restricted to the / of it?
Does it mean that either I have to extract the .img file in the / of my usb 
key (a bit messy), or that I need to create another partition just for it?


Thx,
JD

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Re: [CentOS] Found duplicate PV


On 04.Dez.2013, at 15:08, Nux! wrote:

 On 04.12.2013 13:43, Markus Falb wrote:
 
 What does this Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7:
 using /dev/sda2 not /dev/md1 message?
 Some logical volumes are virtual disks vor kvm guests. Are these
 guests using sda only and not the mdraid?
 
 Markus,
 
 I see /etc/lvm/lvm.conf has an option to ignore md members and seems on 
 by default in EL6:
 md_component_detection = 1

This is a CentOS 5, but it also has this in lvm.conf, and it's value is 1.

 
 If you run pvdisplay /dev/sda2 what does it show? Normally you should 
 get a Failed to read physical volume /dev/sda2.

# pvs /dev/md1
  Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2 not 
/dev/md1
  PV VG Fmt  Attr PSize PFree  
  /dev/sda2  vg_sys lvm2 a--  1.36T 553.16G

# pvs /dev/sda2
  Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/md1 not 
/dev/sda2
  PV VG Fmt  Attr PSize PFree  
  /dev/md1   vg_sys lvm2 a--  1.36T 553.16G

 ADditionally you can 
 force a filter on the drives, smth like:
 filter = [r|/dev/sda2]

I might try that, but it is not necessary on other machines with the same setup.
It was not necessary on *this* machine (running since several years)

-- 
Thank You, Markus

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[CentOS] lastlog oddity

This is very odd. I updated a user's workstation yesterday. This morning,
I ran lastlog | grep -v Never, and it shows only another admin and myself,
and that's from days ago, but not the user. It shows her as Never logged
in. Meanwhile, last does indeed show her logged in (though not today).

Anyone have any ideas?

mark



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Re: [CentOS] Found duplicate PV


On 04.Dez.2013, at 15:11, m.r...@5-cent.us wrote:

 Markus Falb wrote:
 ...
 # pvdisplay
 Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2 not
 /dev/md1
 --- Physical volume ---
 PV Name   /dev/sda2
 VG Name   vg_sys
 PV Size   1.36 TB / not usable 6.81 MB
 snip
 smartctl -t short
 to start. And is there anything in your logfiles saying something like 
 Device: /dev/sdb [SAT], 98 Currently unreadable (pending) sectors?

Interesting, I have this in /etc/smartd.conf
DEVICESCAN -n standby -a -m root -s (L/../../6/00|S/../.././00)

but according to the selftest logs it seems it is only checking sdb but *not* 
sda. I'll have to check this out.
A manual short test succeeded.
However, a failing disk should not affect LVM, should it?

-- 
Markus

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Re: [CentOS] Found duplicate PV

2013-12-04 Thread Pavel Lisy

Markus Falb píše v St 04. 12. 2013 v 15:44 +0100:
 On 04.Dez.2013, at 15:08, Nux! wrote:
 
  On 04.12.2013 13:43, Markus Falb wrote:
  
  What does this Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7:
  using /dev/sda2 not /dev/md1 message?
  Some logical volumes are virtual disks vor kvm guests. Are these
  guests using sda only and not the mdraid?
  
  Markus,
  
  I see /etc/lvm/lvm.conf has an option to ignore md members and seems on 
  by default in EL6:
  md_component_detection = 1
 
 This is a CentOS 5, but it also has this in lvm.conf, and it's value is 1.

from man lvm.conf
---
md_component_detection  — If set to 1, LVM2 will ignore
  devices  used  as  components  of  software  RAID  (md)
  devices  by  looking  for  md superblocks. This doesn’t
  always work satisfactorily e.g. if a  device  has  been
  reused without wiping the md superblocks first.
---

  
  If you run pvdisplay /dev/sda2 what does it show? Normally you should 
  get a Failed to read physical volume /dev/sda2.
 
 # pvs /dev/md1
   Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2 not 
 /dev/md1
   PV VG Fmt  Attr PSize PFree  
   /dev/sda2  vg_sys lvm2 a--  1.36T 553.16G
 
 # pvs /dev/sda2
   Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/md1 not 
 /dev/sda2
   PV VG Fmt  Attr PSize PFree  
   /dev/md1   vg_sys lvm2 a--  1.36T 553.16G
 
  ADditionally you can 
  force a filter on the drives, smth like:
  filter = [r|/dev/sda2]
 
 I might try that, but it is not necessary on other machines with the same 
 setup.
 It was not necessary on *this* machine (running since several years)

I've seen this problem on two machines (It came after some update on CentOS 5 )

you can set filter more strict to avoid bad detection
filter = [ a/.*/ , r|/dev/md.*| ]

Pavel

-- 
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Re: [CentOS] lastlog oddity

2013-12-04 Thread Liam O'Toole

On 2013-12-04, m.r...@5-cent.us m.r...@5-cent.us wrote:
 This is very odd. I updated a user's workstation yesterday. This morning,
 I ran lastlog | grep -v Never, and it shows only another admin and myself,
 and that's from days ago, but not the user. It shows her as Never logged
 in. Meanwhile, last does indeed show her logged in (though not today).

 Anyone have any ideas?

 mark

Does the user log in through gdm only? gdm doesn't update
/var/log/lastlog these days.

-- 

Liam


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[CentOS] To discard... or not to discard...

Hi,

I just recently read a post about SSD triming (discard vs fstrim):

 
http://www.howtogeek.com/176978/ubuntu-doesnt-trim-ssds-by-default-why-not-and-how-to-enable-it-yourself/So
 far I used discard on all my SSDs.
Now I am wondering if it is really worth it to switch them all to a crontabed 
fstrim...
Anyone made the switch yet?


Thx,
JD

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Re: [CentOS] Outbound traffic spike every 30 minutes

2013-12-04 Thread Bowie Bailey

On 12/4/2013 4:47 AM, Heiko Specht wrote:
 hi,
 i aggree with mark.
 maybe iftop -P would work for you...
 and if you can determine a port from iftop you could run lsof -Pn | grep 
 :Port to list the daemon which uses this port.

 that is what i would try..

 Heiko

 m.r...@5-cent.us 03.12.2013 23:15 
 Bowie Bailey wrote:
 On 12/3/2013 4:49 PM, m.r...@5-cent.us wrote:
 Bowie Bailey wrote:
 Since Sunday morning, one of my CentOS servers has been generating a
 small spike of outbound traffic every 30 minutes (X:00 and X:30). It's
 not enough traffic to really cause any notice except for the fact that
 it is a very regular pattern and it started abruptly at midnight
 Sunday.

 This server is used for mail (Courier-MTA), and DNS (Bind).  I cannot
 find anything unusual in either of those logs.  I tried grepping
 through my firewall logs, but have been unable to find anything useful
 there
 either.  I don't see any cron jobs that would generate network traffic.

 Any suggestions how I can go about tracking this down?
 Run rkhunter?

 Actually, if it's that regular, you could run tcpdump when you expect
 it.
 rkhunter complained about a few files, but rpm --verify doesn't flag
 any of them.  Other than that, just a few insecure settings and out of
 date programs, which are not ideal, but do not indicate a problem on
 their own.

 I could try running tcpdump or wireshark, but that's going to generate a
 lot of data and I'm not sure how to go about filtering it.  I know the
 spike happens on the hour and half hour, but my traffic monitor does not
 give me enough detail to see exactly when it starts or exactly how long
 it lasts and I don't know what protocol or port I'm looking for.

 Dumb idea: run top and see if something spikes.

iftop helped me track it down.  It was actually starting at :05 and 
:25.  One of my email clients received a 20M email and was having 
problems downloading it.  Every 30 minutes, the pop client would 
connect, try to download the emails, and then disconnect after 2 minutes.

Thanks for the suggestions everyone!

-- 
Bowie
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Re: [CentOS] lastlog oddity

Liam O'Toole wrote:
 On 2013-12-04, m.r...@5-cent.us m.r...@5-cent.us wrote:
 This is very odd. I updated a user's workstation yesterday. This
 morning, I ran lastlog | grep -v Never, and it shows only another admin
and
 myself, and that's from days ago, but not the user. It shows her as Never
 logged in. Meanwhile, last does indeed show her logged in (though not
today).

 Anyone have any ideas?

 Does the user log in through gdm only? gdm doesn't update
 /var/log/lastlog these days.

Looks like you got it in one. Thanks!

Yet another reason to dislike gnome

   mark

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Re: [CentOS] Found duplicate PV


On 04.Dez.2013, at 15:57, Markus Falb wrote:

 
 On 04.Dez.2013, at 15:11, m.r...@5-cent.us wrote:
 
 Markus Falb wrote:
 ...
 # pvdisplay
 Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2 not
 /dev/md1
 --- Physical volume ---
 PV Name   /dev/sda2
 VG Name   vg_sys
 PV Size   1.36 TB / not usable 6.81 MB
 snip
 smartctl -t short
 to start. And is there anything in your logfiles saying something like 
 Device: /dev/sdb [SAT], 98 Currently unreadable (pending) sectors?
 
 Interesting, I have this in /etc/smartd.conf
 DEVICESCAN -n standby -a -m root -s (L/../../6/00|S/../.././00)
 
 but according to the selftest logs it seems it is only checking sdb but *not* 
 sda. I'll have to check this out.
 A manual short test succeeded.
 However, a failing disk should not affect LVM, should it?

oh,

...
# pvs /dev/sda2
  Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/md1 not 
/dev/sda2
  PV VG Fmt  Attr PSize PFree  
  /dev/md1   vg_sys lvm2 a--  1.36T 553.16G

# pvs /dev/sdb2
  Failed to read physical volume /dev/sdb2
...

smart status tells me

...
5 Reallocated_Sector_Ct   0x0033   001   001   036Pre-fail  Always   
FAILING_NOW 4095
...

smartd did not send warning mail, selftests are successful, only in the 
logfiles is

...
Device: /dev/sdb [SAT], FAILED SMART self-check. BACK UP DATA NOW! 
Device: /dev/sdb [SAT], Failed SMART usage Attribute: 5 Reallocated_Sector_Ct.
...

I think I will replace sdb. 

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Re: [CentOS] CentOS 6.5 VirtualBox

2013-12-04 Thread Rainer Traut

Am 04.12.2013 13:39, schrieb Lars Hecking:
 Toralf Lund writes:

 So, have any of you lot seen this? Is there a way to make things work?

   
 http://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.5#head-eb6bb9abad0158d054915e0090560f6d1ff8f1ed

I guess the threadstarter meant VB on the host.

This release note is about C6.5 as guest under VB.
There is again breakage in VB 4.3.4 guest additions, see this link for a 
workaround:
https://forums.oracle.com/message/11282251

Rainer


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Re: [CentOS] To discard... or not to discard...

2013-12-04 Thread Leon Fauster

Am 04.12.2013 um 17:08 schrieb John Doe jd...@yahoo.com:
 I just recently read a post about SSD triming (discard vs fstrim):
 
  
 http://www.howtogeek.com/176978/ubuntu-doesnt-trim-ssds-by-default-why-not-and-how-to-enable-it-yourself/So
  far I used discard on all my SSDs.
 Now I am wondering if it is really worth it to switch them all to a crontabed 
 fstrim...
 Anyone made the switch yet?



https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Storage_Administration_Guide/#idm34358800

Red Hat recommends batch discard operations ... (fstrim)

--
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Re: [CentOS] died again

On Wed, 4 Dec 2013, Steve Clark wrote:

 Also did you check the Health Status in the BIOS, was the temperature in
 spec with what the chip spec is. You can run cpuburn (program) and see if
 running the processor full out causes it to shutdown.

Once upon a time, the CPU area temperature was 80 C,
which got a BING! BING! BING! from m.roth.

Also, the last time  checked I noticed that 5v was 5.263, more than 3% error.


On Tue, 3 Dec 2013, Thomas Dineen wrote:

It will be easier and cheaper to by a static grounding strap
 that you wear on your wrist and connect to a conducting part
 of the metal cabnet.

My plan involved a wire-wrap wire bracelet and a megohm resistor.
Connecting the other end to a bare metal part of the case is sufficient?
I don't need an actual ground?


-- 
Michael   henne...@web.cs.ndsu.nodak.edu
SCSI is NOT magic. There are *fundamental technical
reasons* why it is necessary to sacrifice a young
goat to your SCSI chain now and then.   --   John Woods
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Re: [CentOS] died again

On 12/4/2013 9:42 AM, Michael Hennebry wrote:
 Once upon a time, the CPU area temperature was 80 C,
 which got a BING! BING! BING! from m.roth.

 Also, the last time  checked I noticed that 5v was 5.263, more than 3% error.

I'd only believe that if you double checked it with a known accurate 
volt meter.



-- 
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somewhere on the middle of the left coast

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Re: [CentOS] Found duplicate PV

Markus Falb wrote:

 On 04.Dez.2013, at 15:57, Markus Falb wrote:
 On 04.Dez.2013, at 15:11, m.r...@5-cent.us wrote:
 Markus Falb wrote:
 ...
 # pvdisplay
 Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/sda2
 not /dev/md1
 --- Physical volume ---
 PV Name   /dev/sda2
 VG Name   vg_sys
 PV Size   1.36 TB / not usable 6.81 MB
 snip
 smartctl -t short
 to start. And is there anything in your logfiles saying something like
 
 Device: /dev/sdb [SAT], 98 Currently unreadable (pending) sectors?

 Interesting, I have this in /etc/smartd.conf
 DEVICESCAN -n standby -a -m root -s (L/../../6/00|S/../.././00)

 but according to the selftest logs it seems it is only checking sdb but
 *not* sda. I'll have to check this out.
 A manual short test succeeded.
 However, a failing disk should not affect LVM, should it?

 oh,

 ...
 # pvs /dev/sda2
   Found duplicate PV b79x0kLXR9mAC0z0IZUxyJG1VC24Crl7: using /dev/md1 not
 /dev/sda2
   PV VG Fmt  Attr PSize PFree
   /dev/md1   vg_sys lvm2 a--  1.36T 553.16G

 # pvs /dev/sdb2
   Failed to read physical volume /dev/sdb2
 ...

 smart status tells me

 ...
 5 Reallocated_Sector_Ct   0x0033   001   001   036Pre-fail  Always
 FAILING_NOW 4095
 ...

 smartd did not send warning mail, selftests are successful, only in the
 logfiles is

 ...
 Device: /dev/sdb [SAT], FAILED SMART self-check. BACK UP DATA NOW!
 Device: /dev/sdb [SAT], Failed SMART usage Attribute: 5
 Reallocated_Sector_Ct.
 ...

 I think I will replace sdb.

Good idea. You really want to do that before your logs suddenly fill with
DRDY errors

mark

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Re: [CentOS] To discard... or not to discard...

2013-12-04 Thread Akemi Yagi

On Wed, Dec 4, 2013 at 9:20 AM, Leon Fauster leonfaus...@googlemail.com wrote:
Am 04.12.2013 um 17:08 schrieb John Doe jd...@yahoo.com:
I just recently read a post about SSD triming (discard vs fstrim):

http://www.howtogeek.com/176978/ubuntu-doesnt-trim-ssds-by-default-why-not-and-how-to-enable-it-yourself/So
far I used discard on all my SSDs.
Now I am wondering if it is really worth it to switch them all to a
crontabed fstrim...
Anyone made the switch yet?

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Storage_Administration_Guide/#idm34358800

Red Hat recommends batch discard operations ... (fstrim)
--
LF

In addition to the RH doc referenced by LF, I found this web page useful:

http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/

Quote:
This is the most interesting part. Most people simply add the option
“discard” in the mounting options at /etc/fstab. However, this means
that every time you delete a file, the OS will be reporting in
real-time to the SSD which blocks were occupied by that file and are
not longer in use, and then the SSD will have to perform a
defragmentation and deletion of those internal blocks, operation which
will take an amount of time higher than desired.

In order to optimize the performance of the SSD, I strongly advise you
to avoid doing the TRIM operation in real time (whenever a file is
deleted) because you would be putting an unnecessary extra amount of
work over the SSD. In other words: You should not enable the discard
option in fstab.

Instead, what I recommend is to run a script periodically to tell the
SSD which blocks are free with the command fstrim. Doing this
operation daily or weekly is more than enough. This way we do not lose
any performance due to TRIM when deleting files and we periodically
keep informed the SSD about the free blocks.

Akemi
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Re: [CentOS] died again

On Wed, 4 Dec 2013, John R Pierce wrote:

 On 12/4/2013 9:42 AM, Michael Hennebry wrote:
 Once upon a time, the CPU area temperature was 80 C,
 which got a BING! BING! BING! from m.roth.

 Also, the last time  checked I noticed that 5v was 5.263, more than 3% error.

 I'd only believe that if you double checked it with a known accurate
 volt meter.

From that comment, I infer that were 5.263 the actual voltage,
my computer would be misbehaving much more severely.

-- 
Michael   henne...@web.cs.ndsu.nodak.edu
SCSI is NOT magic. There are *fundamental technical
reasons* why it is necessary to sacrifice a young
goat to your SCSI chain now and then.   --   John Woods
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Re: [CentOS] SOHO colour laser printer recommendations

2013-12-04 Thread Bill Campbell

On Tue, Dec 03, 2013, Ned Slider wrote:
Hi List,

I'd really appreciate some recommendations for colour laser printers for
use with CentOS. It's for light home use with CentOS 5 and CentOS 6 systems.

Must have:

1. Colour. Quality not that important as mainly for kids school project
type of stuff.
2. Ethernet connectivity - want something I can plug into the network
3. Cheap running costs - don't want to be spending a fortune on toner
4. Linux support

I have very little experience with printing on Linux. I'm assuming I
want a laser with Postscript and/or PCL emulation, and Linux driver
support (still not sure exactly what I should be looking for here).

Top of my very short list at present is:

Brother HL-4140CN at £167

http://www.amazon.co.uk/Brother-HL4140CN-Network-Colour-Printer/dp/B0047753F4/ref=sr_1_1?ie=UTF8qid=1386105929sr=8-1keywords=brother+hl-4140cn

I'd appreciate any other recommendations people might have.

I replaced the HP with a Ricoh Aficio SP C242sf. This wasn't
cheap, but toner costs are about 1/3 that of the HP when buying
the ones with 6,000 page capacity.

Bill
--
INTERNET: b...@celestial.com Bill Campbell; Celestial Software LLC
URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way
Voice: (206) 236-1676 Mercer Island, WA 98040-0820
Fax:(206) 232-9186 Skype: jwccsllc (206) 855-5792

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Re: [CentOS] died again

Michael Hennebry wrote:
 On Wed, 4 Dec 2013, John R Pierce wrote:

 On 12/4/2013 9:42 AM, Michael Hennebry wrote:
 Once upon a time, the CPU area temperature was 80 C,
 which got a BING! BING! BING! from m.roth.

 Also, the last time  checked I noticed that 5v was 5.263, more than 3%
 error.

 I'd only believe that if you double checked it with a known accurate
 volt meter.

From that comment, I infer that were 5.263 the actual voltage,
 my computer would be misbehaving much more severely.

Hmmm... that's a though: once you open it up, you might disconnect and
measure the output of the power supply with a multimeter. If that's
misbehaving, you're talking $40 or so for a new one.

   mark

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Re: [CentOS] died again

2013-12-04 Thread Warren Young

On 12/3/2013 22:09, Michael Hennebry wrote:
 On Tue, 3 Dec 2013, Patrick Lists wrote:

 They mention high-purity isopropyl alcohol.
 The highest purity I've ever seen is 70%.

The vast majority of the impurity in commercial grade alcohol is water. 
  Capillary action sucks the fluid into all kinds of areas you might not 
expect -- like under chips -- and it stays there longer than you might 
guess because restricted airflow goes hand in hand with capillary 
action.  Also, water evaporates far less readily than alcohol, 
increasing drying time.

The rest of the impurity is dissolved solids, which gets left behind 
when the liquid evaporates.  It also makes the fluid conductive.  (Pure 
alcohol and pure water are *not* conductive.)  Conductive liquid is 
obviously bad for computers, especially if it's still present when you 
apply power.  See previous paragraph. :)

Bottom line: 70% is too impure for this task.

I hesitate to use even 90% for this.  The last time I used 90% isopropyl 
on a PCB, it left behind a white haze that I had to scrub off with a dry 
toothbrush.

I bought a box (!) of 99% isopropyl years ago: http://goo.gl/7DYP8Y

It's fairly expensive to ship, but even so, it comes out cheaper than 
the alternatives you're likely to have locally.  Figure $0.30 - $0.40 
per ounce, all told.  You'll probably be set for life.  (Tip: Add a 
Menda bottle for your work table to your order, so you can keep the box 
safe, like in a shed or garage.)

Radio Shack used to sell tape head cleaner for $1 an ounce.  I'd guess 
it's no longer available because there's not as much call for tape head 
cleaning products these days.

While looking for up-to-date info on Radio Shack's web site, I came 
across this relevant item: http://goo.gl/nLzub7  At $11 for a couple of 
tiny bottles, both of which you have to use together, it's another 2-3x 
more expensive than tape head cleaner.  Plus, if you look into the MSDS, 
the first part is acidic, so you must need the second pass to neutralize 
what's left behind on the first pass.  Sounds like a bad plan to me.

Everclear 190 proof should also work for this.  At $20 per fifth, it 
comes out under $1/oz, so cheaper than the RS fluids, but still more 
expensive than the box o' isopropyl.  Some households will find it a 
more widely useful commodity, so there's that. :)

For what it's worth, you can get even purer isopropyl alcohol intended 
for lab use.  Prices I found online ranged from about $60-100 per liter, 
or $2-3/oz, shipped.  100% is possible if you synthesize it, at even 
higher cost.
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Re: [CentOS] SOHO colour laser printer recommendations

Bill Campbell wrote:
On Tue, Dec 03, 2013, Ned Slider wrote:

I'd really appreciate some recommendations for colour laser printers for
use with CentOS. It's for light home use with CentOS 5 and CentOS 6
systems.

Must have:

Top of my very short list at present is:

Brother HL-4140CN at £167

http://www.amazon.co.uk/Brother-HL4140CN-Network-Colour-Printer/dp/B0047753F4/ref=sr_1_1?ie=UTF8qid=1386105929sr=8-1keywords=brother+hl-4140cn

I'd appreciate any other recommendations people might have.

First off I would stay away from HP printers. As others have
said, they used to make quality products (I have an HP 4M+ that's
been going since November 1995), but the current ones aren't very
good. I bought a new CP2025DN which worked nicely until my wife
managed to break something in the duplexer while loading paper,
and HP wouldn't sell the parts to the shop to repair it. The 4
toner cartridges also cost over $100USD each.
snip
Our CP 3525dn's, the first of which showed up around '10, are reliable
workhorses. BUT: I do *NOT* buy OEM toner cartridges. Get replacement
compatibles online - they're half to a third the cost, and I've only had
one or two be defective (out of dozens).*

My LJ1018, bought in '08, is small, cute, and reliable. No problems (I
didn't say anything, this isn't hubris)g

mark

* And the next person who announces that everyone who works for the US fed
gov't as an employee or contractor is free with tax money, I have one of
two defective ones sitting around that I'd like to shove down his throat.

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Re: [CentOS] To discard... or not to discard...

2013-12-04 Thread Paul Heinlein


On Wed, 4 Dec 2013, Akemi Yagi wrote:


In addition to the RH doc referenced by LF, I found this web page useful:

http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/

Quote: []

Instead, what I recommend is to run a script periodically to tell 
the SSD which blocks are free with the command fstrim. Doing this 
operation daily or weekly is more than enough. This way we do not 
lose any performance due to TRIM when deleting files and we 
periodically keep informed the SSD about the free blocks.


I was pondering dropping in a cron job that invokes fstrim on servers 
with SSDs, esp. now that 6.5 supports TRIM on MD RAID-1 devices. It 
appears that making it a weekly job will do the trick.


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Re: [CentOS] died again

On 12/4/2013 10:22 AM, Michael Hennebry wrote:
 On Wed, 4 Dec 2013, John R Pierce wrote:

 On 12/4/2013 9:42 AM, Michael Hennebry wrote:
 Once upon a time, the CPU area temperature was 80 C,
 which got a BING! BING! BING! from m.roth.
 
 Also, the last time  checked I noticed that 5v was 5.263, more than 3% 
 error.
 
 I'd only believe that if you double checked it with a known accurate
 volt meter.
 From that comment, I infer that were 5.263 the actual voltage,
 my computer would be misbehaving much more severely.

almost nothing in the system actually runs directly on 5V anymore. the 
CPU runs on some fraction of a volt at stupid high current, generated by 
DC-DC regulators which use the 12V supply as their input.  Ditto, the 
ram runs on like 1.8V nowdays, same thing, regulated off 12V.   most 
peripheral logic is 3V or less nowdays.

disk drives use 5V (and 3.5 drives use 12V) but they also ahve their 
own internal voltage converters and regulators.






-- 
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somewhere on the middle of the left coast

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Re: [CentOS] died again

2013-12-04 Thread Peter

On 12/05/2013 06:42 AM, Michael Hennebry wrote:
 My plan involved a wire-wrap wire bracelet and a megohm resistor.
 Connecting the other end to a bare metal part of the case is sufficient?
 I don't need an actual ground?

No you need an actual ground.  If the case is left plugged in this would
be sufficient but is probably a bad idea for other (obvious) reasons.
Find something else to attach the strap (or whatever) to and make sure
it's grounded.


Peter

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Re: [CentOS] died again

On 12/4/2013 11:25 AM, Peter wrote:
 On 12/05/2013 06:42 AM, Michael Hennebry wrote:
 My plan involved a wire-wrap wire bracelet and a megohm resistor.
 Connecting the other end to a bare metal part of the case is sufficient?
 I don't need an actual ground?
 No you need an actual ground.  If the case is left plugged in this would
 be sufficient but is probably a bad idea for other (obvious) reasons.
 Find something else to attach the strap (or whatever) to and make sure
 it's grounded.


the case has to be grounded to the same ground or it won't do much good.

I've never had any issues with static as long as I touch the metal 
chassis first before handling circuitry, but I also live on the coast 
where we don't need air conditioning, and hte humidity is moderate.


-- 
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somewhere on the middle of the left coast

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Re: [CentOS] died again

On Wed, 4 Dec 2013, Warren Young wrote:

 On 12/3/2013 22:09, Michael Hennebry wrote:

 They mention high-purity isopropyl alcohol.
 The highest purity I've ever seen is 70%.

 Bottom line: 70% is too impure for this task.

 I hesitate to use even 90% for this.  The last time I used 90% isopropyl

 While looking for up-to-date info on Radio Shack's web site, I came
 across this relevant item: http://goo.gl/nLzub7  At $11 for a couple of
 tiny bottles, both of which you have to use together, it's another 2-3x
 more expensive than tape head cleaner.  Plus, if you look into the MSDS,
 the first part is acidic, so you must need the second pass to neutralize
 what's left behind on the first pass.  Sounds like a bad plan to me.

For me, the bottom line is how much it will cost
to clean *one* CPU/heat spreader combination.
It looks like the answer is going to be
a bottle I saw at Radio Shack for $11.

 Everclear 190 proof should also work for this.  At $20 per fifth, it
 comes out under $1/oz, so cheaper than the RS fluids, but still more
 expensive than the box o' isopropyl.  Some households will find it a
 more widely useful commodity, so there's that. :)

I didn't use everclear when I did drink.

 For what it's worth, you can get even purer isopropyl alcohol intended
 for lab use.  Prices I found online ranged from about $60-100 per liter,
 or $2-3/oz, shipped.  100% is possible if you synthesize it, at even
 higher cost.

I'm not sure what you mean by synthesize in this context.
Alternating freeze- and evaporative-distillation
can get you anything less than 100%.
That said, 'tain't necessarily economical.
At some point, I suspect getting rid of the water through
electrolysis or some other chemistry might be better.

-- 
Michael   henne...@web.cs.ndsu.nodak.edu
SCSI is NOT magic. There are *fundamental technical
reasons* why it is necessary to sacrifice a young
goat to your SCSI chain now and then.   --   John Woods
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Re: [CentOS] died again

On Wed, 4 Dec 2013, John R Pierce wrote:

 On 12/4/2013 11:25 AM, Peter wrote:
 On 12/05/2013 06:42 AM, Michael Hennebry wrote:
 My plan involved a wire-wrap wire bracelet and a megohm resistor.
 Connecting the other end to a bare metal part of the case is sufficient?
 I don't need an actual ground?
 No you need an actual ground.  If the case is left plugged in this would
 be sufficient but is probably a bad idea for other (obvious) reasons.
 Find something else to attach the strap (or whatever) to and make sure
 it's grounded.


 the case has to be grounded to the same ground or it won't do much good.

The new plan is to connect myself to the case through a megohm resistor
and the case to a heating vent through another megohm resistor.

-- 
Michael   henne...@web.cs.ndsu.nodak.edu
SCSI is NOT magic. There are *fundamental technical
reasons* why it is necessary to sacrifice a young
goat to your SCSI chain now and then.   --   John Woods
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Re: [CentOS] died again

On 12/4/2013 10:44 AM, Warren Young wrote:
 Bottom line: 70% is too impure for this task.


Huh?!?  I've cleaned numerous CPU-heatsink surfaces with 70% isopropyl, 
never had any problem  heck, I clean optical lenses with it, in the 
form of those eyeglass wipes you buy by the crate at Costco.

in tests we did 30 something years ago, the 90% medical stuff left a 
white haze, while the 70% regular rubbing stuff didn't.   we were using 
it for cleaning the heads and tape paths of 9 track computer tape 
drives.sure, the analytic laboratory grade was clean, but also 
stupid expensive, as we were going through a quart a week cleaning a 
dozen high speed tape drives 3 shifts a day 6 days a week (they were in 
constant use loading tapes shipped to us from vendors, so got rather 
dirty rather fast).








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Re: [CentOS] died again

2013-12-04 Thread Eliezer Croitoru

Hey there,

He has a 3.2 Ghz CPU which is much more then this 3800 but the only 
thing that the 3800+ is good is that it has 2 cores but still same low 
share ram ( I had one of these in the past).

Eliezer

On 28/11/13 12:29, John R Pierce wrote:
 On 11/26/2013 3:58 PM, Michael Hennebry wrote:
 $300 desktops? Where?

 how about under $100 for a complete desktop?

 http://www.newegg.com/Special/ShellShocker.aspx?nm_mc=EMC-SD112013cm_mmc=EMC-SD112013-_-SD112813-_-item-_-83-155-932et_cid=3212et_rid=117069

 you'll need to subscribe to newegg's shellshocker list before you can
 order it, and this deal is only 'visible' and valid from 3-6pm PST
 tomorrow (Thanksgiving Day), its a refurb Dell OptiPlex GX740 stripped
 model, miditower with an AMD Athlon 64 X2 3800+ dual core 2Ghz, 2GB ram,
 80GB HD, keyboard, mouse.   For $95 (after a $10 mail-in-rebate).
 I'd want to add at least 4GB more memory (it will take max 4 x 2GB ==
 8GB DDR2 dimms... I suspect it comes with 2 x 1GB), and  my existing
 SATA disks (it has 4 SATA ports).




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Re: [CentOS] To discard... or not to discard...

2013-12-04 Thread Leon Fauster

Am 04.12.2013 um 19:20 schrieb Akemi Yagi amy...@gmail.com:
 On Wed, Dec 4, 2013 at 9:20 AM, Leon Fauster leonfaus...@googlemail.com 
 wrote:
 Am 04.12.2013 um 17:08 schrieb John Doe jd...@yahoo.com:
 I just recently read a post about SSD triming (discard vs fstrim):
 
 http://www.howtogeek.com/176978/ubuntu-doesnt-trim-ssds-by-default-why-not-and-how-to-enable-it-yourself/So
  far I used discard on all my SSDs.
 Now I am wondering if it is really worth it to switch them all to a 
 crontabed fstrim...
 Anyone made the switch yet?
 
 https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Storage_Administration_Guide/#idm34358800
 
 Red Hat recommends batch discard operations ... (fstrim)
 
 
 In addition to the RH doc referenced by LF, I found this web page useful:
 
 http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/


interesting article. it shows the passthrough of the discard option with 
dm-crypt involved. rhel seems to not provide such dm-crypt/trim support. 

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/ch-ssd.html#ssddeploy

The only DM targets that do not support discards are dm-snapshot, dm-crypt, 
and dm-raid45.

maybe with the next minor release?

--
LF


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[CentOS] yum update interruption recovery

Hi All:

I am having problems with a CentOS 6.4 box that I was in the process
of doing a yum update to 6.5. Unfortunately the system hung during
the update and I was forced to reboot it and it is now a bit of a mess.
Can someone point me in the direction of any documentation that would
assist in the recovering from this.

TIA

Regards, Hugh

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Re: [CentOS] yum update interruption recovery

2013-12-04 Thread Jitse Klomp

On 12/04/2013 11:34 PM, Hugh E Cruickshank wrote:
 Hi All:

 I am having problems with a CentOS 6.4 box that I was in the process
 of doing a yum update to 6.5. Unfortunately the system hung during
 the update and I was forced to reboot it and it is now a bit of a mess.
 Can someone point me in the direction of any documentation that would
 assist in the recovering from this.

Run yum-complete-transaction.

Source: 
http://www.redhat.com/archives/rhl-devel-list/2008-September/msg00984.html

  - Jitse
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Re: [CentOS] yum update interruption recovery

FromJitse Klomp Sent: December 4, 2013 14:47
 On 12/04/2013 11:34 PM, Hugh E Cruickshank wrote:
 
  I am having problems with a CentOS 6.4 box that I was in the process
  of doing a yum update to 6.5. Unfortunately the system hung during
  the update and I was forced to reboot it and it is now a bit of a
  mess. Can someone point me in the direction of any documentation
  that would assist in the recovering from this.
 
 Run yum-complete-transaction.

Tried that but it failed. I am now seriously looking at manually
deleting and/or reinstalling a large number of packages but I was
hoping that there might be some recommended procedures available out
there that might be easier.

TIA

Regards, Hugh

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Re: [CentOS] yum update interruption recovery

2013-12-04 Thread Frank Cox

On Wed, 4 Dec 2013 14:55:03 -0800
Hugh E Cruickshank wrote:

 Tried that but it failed. 

Describe failed.

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Re: [CentOS] yum update interruption recovery

From: Frank Cox Sent: December 4, 2013 15:04
 On Wed, 4 Dec 2013 14:55:03 -0800 Hugh E Cruickshank wrote:
  Tried that but it failed. 
 
 Describe failed.

That happened yesterday and I can not recall specifically what it said.
I am currently in the process of backing up the hard drive before 
proceeding any further. I will see if I can get the error a little
later today.

Regards, Hugh

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Re: [CentOS] died again

2013-12-04 Thread Warren Young

On Dec 4, 2013, at 1:49 PM, John R Pierce pie...@hogranch.com wrote:

 On 12/4/2013 10:44 AM, Warren Young wrote:
 Bottom line: 70% is too impure for this task.
 
 Huh?!?  I've cleaned numerous CPU-heatsink surfaces with 70% isopropyl, 
 never had any problem….

I'm not saying it's impossible.  An expert can ameliorate many risks through 
skill.  That is no reason to recommend a risky process.

I listed the theoretical risks in my previous post.  Now for some experimental 
data.

I filled a plastic bowl to a depth of 1 inch with the contents of a 21-year-old 
bottle of 70% rubbing alcohol from my medicine cabinet.  (Ah, 1992…it was a 
good year.)  I then inserted my bench DMM's probes into the bowl, spacing them 
approximately 1 inch apart.  I read 377 kΩ.

I sanity checked this measurement by moving the probes closer to each other, 
then farther apart, and observed that the resistance changed as expected.

I poured the rubbing alcohol back into the bottle, dried the bowl with a towel, 
poured the contents of my electronics bench's Menda bottle -- nominally 99+% 
pure isopropyl alcohol -- into the bowl, then tested again.  This time I read 
over 2 MΩ.

I was expecting a higher value, or even an overload indication.  I decided to 
refill the Menda bottle straight from the cubitainer in order to rule out 
impurities in the bowl, and also the natural concentration of impurities due to 
evaporation from the Menda bottle.  This time I read over 8 MΩ.

You questioned someone else's DMM in another post, so I will pre-defend mine.  
It's a general purpose bench meter, not a dedicated insulation tester, but it 
will go up to 1 GΩ, and the company that made the meter isn't the sort that 
publishes bogus specs.  It's been a while since it was calibrated, but for 3 
digit readings, I'm confident enough in its quality of design and manufacture 
to trust those readings anyway.

 I clean optical lenses with it, in the 
 form of those eyeglass wipes you buy by the crate at Costco.

I use my tee shirt.  :)

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Re: [CentOS] died again

On 12/4/2013 7:50 PM, Warren Young wrote:
 You questioned someone else's DMM in another post,

actually, the other post didn't say how he measured the voltage, I was 
assuming via the motherboard monitoring circuits ('lmsensors' or 
whatever), which are notoriously inaccurate ...



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Re: [CentOS] died again

2013-12-04 Thread Warren Young

On Dec 4, 2013, at 1:22 PM, Michael Hennebry henne...@web.cs.ndsu.nodak.edu 
wrote:

 On Wed, 4 Dec 2013, Warren Young wrote:
 
 At $11 for a couple of
 tiny bottles, both of which you have to use together, it's another 2-3x
 more expensive than tape head cleaner.
 
 For me, the bottom line is how much it will cost
 to clean *one* CPU/heat spreader combination.

Because I always have a Menda bottle full of high-purity alcohol on the 
electronics bench, I find many uses for it.

If I had to drive to Radio Shack every ounce or so to get a refill, I would 
doubtless not bother for most jobs.

 100% is possible if you synthesize it
 
 I'm not sure what you mean by synthesize in this context.

I mean assemble the molecules from bulk quantities of their constituent 
elements. :)  Chemical engineering.

As my measurement data in the post I just sent hints, there are serious 
practical problems -- aside from the direct economic ones -- that restrict the 
utility of such high-purity alcohols.  There's probably no point using it 
outside a cleanroom.  Dust on the glassware will wreck the purity rating 
otherwise.
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Re: [CentOS] yum update interruption recovery

From: Hugh E Cruickshank Sent: December 4, 2013 15:09
 From: Frank Cox Sent: December 4, 2013 15:04
  On Wed, 4 Dec 2013 14:55:03 -0800 Hugh E Cruickshank wrote:
   Tried that but it failed. 

  Describe failed.

 That happened yesterday and I can not recall specifically what it
 said. I am currently in the process of backing up the hard drive
 before proceeding any further. I will see if I can get the error a
 little later today.

Well I am unable to locate the error message as it does not appear to
be logged. In the interim I have done a lot more research and I now
suspect that I have two separate problems:

1. Since the yum update did not complete then it never had a chance
   to update the rpm database,

2. We probably have one or more packages that have been install but
   the predecessor has not be removed.

I have done the following:

a. Rebuilt the rpm database:

rm -f /var/lib/rpm/__db*
rpm --rebuilddb

b. I then retried the yum update this aborted report conflicts in
   systemtap packages.

c. I listed the installed systemtap packages:

   rpm -qa | grep systemtap | sort

   This revealed that there were two systemtap-devel packages
   installed and I removed the newer one.

d. I then retried yum update and this appeared to work fine until it
   got to:

   Cleanup  : 1:xorg-x11-drv-nouveau-1.0.1-3.el6.x86_64  286/513

At this point the system appears to be hung. I can not proceed any
further this evening as I am working on this from home and I do not
have physical access to the server to reboot it. In the morning I
will reboot the server and try again but this time I am going to do
a yum clean all to the rpm database rebuild.

Any thoughts or comments would be appreciated.

That's al for now.

Regards, Hugh

-- 
Hugh E Cruickshank, Forward Software, www.forward-software.com

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Re: [CentOS] died again

2013-12-04 Thread Darr247

My money's still on bulging and 50% or so under (if not ruptured and 99% 
below) capacitance electrolytics.
If not on the motherboard itself, then in the power supply.
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Re: [CentOS] died again