I have been using rsnapshot for years, with great success.
https://rsnapshot.org/
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works but must be licensed.
Not sure if it works for you, but there’s an SQL server that runs on
Linux.
https://docs.microsoft.com/en-us/sql/linux/sql-server-linux-overview?view=sql-server-2017
The Express version (which would be enough for my case) is free.
Not sure if it works for you, but there’s an SQL server that runs on Linux.
I am aware of that, and it would be my first choice. Unfortunately, in
addition they want to use some damned printing account software, which
only runs on Windows :-(
So far you have not provided stats on server usage (cpu,ram) over a
24hour or 7 day 8am-5pm timeframe. So I will asume you have plenty of
usage/performance to spare.
Yes, I do.
Unless using SSDs when creating the VM pleae do not use dynamic disk
allocation. MS SQL may be very intensive and you
Do they really need Server for that, or would a workstation do?
A workstation wouldn't do because the number of concurrent connections
to it would be higher than MS allows for a workstation.
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I hope that someone here can give some advice on the following:
I have a Samba based Active Directory. A CentOS 7.6 machine runs as a
file server and hosts the Windows user profiles for all the Windows
workstations.
Now management has decided that they need a Windows server for a couple
of
You seem to be saying that hardware RAID can’t lose data. You’re ignoring the
RAID 5 write hole:
https://en.wikipedia.org/wiki/RAID#WRITE-HOLE
If you then bring up battery backups, now you’re adding cost to the system.
And then some ~3-5 years later, downtime to swap the battery, and
No, I dislike UUIDs. I dislike, strongly, lots of extra typing that
doesn't really get me anything. MAYBE, if you're in a Google or Amazon
datacenter, with 500,000 physical servers (I phone interviewed with them
10 years ago)... but short of that? Nope.
You can (perhaps should...) use the World
>> Could someone recommend good Linux software RAID primer. It would >> be good
>> if it has good coverage of monitoring and dealing with failures.
https://raid.wiki.kernel.org/index.php/Linux_Raid
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>> I can't seem to find apcupsd for C 6. Just went to epel's website,
>> and not visible. Anyone have a clue?
I am running apcupsd on CentOS 6.9, monitoring through the network a common UPS
that is physically connected to another server via USB.
Just download the latest source code and compile
Please ask this question on the Samba list. The probability of getting an
answer is higher there.
sa...@lists.samba.org
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>
> Can't find perl(compress::bzip2) anywhere.
Are you looking for this? (first hit on Google)
http://search.cpan.org/~rurban/Compress-Bzip2-2.25/lib/Compress/Bzip2.pm
Or this?
ftp://195.220.108.108/linux/centos/7.3.1611/os/x86_64/Packages/perl-IO-Compress-2.061-2.el7.noarch.rpm
I'm planning to buy a mobo (z170-K) that has Realtek 8111GR (nic).
Is the Realtek 8111GR supported or I must change mobo?
I have been using a small server with a Realtek 8111E under CentOS 7
without any problem.
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>> I've run into this with ZFS on Linux. The 'blkid' is useful to identify the
>> target device and then add that to your fstab. I don't use device names >>
>> at all anymore, too ambiguous (depending on the circumstance) in my >>
>> opinion.
Right. And there are other ways to identify disks
Two days ago I installed a brand new SSDNow E50 series (Enterprise) disk
on a server. I intend to move the OS there. I just did the physical
install and copied a few files to and from it just to see if it was OK.
I left it there, waiting for an opportunity to configure it to do real work.
Now
any chance your SATA cables aren't up to SATA3 (6gbps) performance
levels ?
In my experience, that's the most likely cause.
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I discovered, amidst great initial pain, that most, if not all, of the
problems I had with SATA disks were caused by SATA cables and not by
the disks themselves. Intermittent problems, such as disks randomly
not showing up in RAID groups, were solved when I replaced the cables
with proper
However, the latest C7 server I built, ran into problems with them on
on a Intel C236 board (SuperMicro X11SSH) with tons of "ata bus error
write fpdma queued". Googling on it threw up old suggestions to limit
SATA link speed to 1.5Gbps using libata.force boot options and/or
noncq. Lowering the
>> How I can assing permission on this share?
You can easily do it by following the instructions on the Samba Wiki:
https://wiki.samba.org/index.php/User_Documentation
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>> Try this. I have been thinking of trying it on C7.
>> http://www.linuxhelp.net/forums/index.php?showtopic=10868
I wouldn't follow the instructions on that link.
Disable iptables? Nah!
The author lumps SELinux and the firewall together.
What is said about DNS is also misleading. DNS is
nowhere does it say that centos is approved for use in DoD. it is not on
the APL, only RedHat and SuSE
So what? If that is so important to you, you can go and buy a RedHat
license.
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Assuming your raid group is /dev/md127, you can run:
ls -l /dev/disk/by-uuid
or
blkid /dev/md127
and use the ID both will show for /dev/md127
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Heh.. yeah. But the client isn't gonna go for that. LOL. Any way to allow
regular ol' FTP using SELinux? Or does that just defeat the purpose of
having a secure SELlinux server entirely?
Maybe use FTP in a jail? Or Linux containers?
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Maybe you can tune ZFS further, but I tried it in userspace (with FUSE) and
reading was a almost 5 times slower than MDADM.
That alone is meaningless. MDADM with which filesystem?
Zfsonlinux does not work in user space, it is a kernel module. Just try it.
Why don't you use Sernet Enterprise Samba?
(...) they do not provide RPMs for RHEL/CentOS 7. So this seems not to be an
option.
As someone said before, you don't need to use the latest and greatest to run
a functional service... On a production environment that is even often
undesirable
Why don't you use Sernet Enterprise Samba?
They provide precompiled packages for a bunch of distros.
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With some SATA drives the mode change can only be done by a software utility.
Some of them don't have jumpers at all.
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The server's manual recommends filling the drive bays in the 1,2,3,4 order.
At this point, you should check the HP support page for the server, Look for
controller firmware updates, BIOS updates, troubleshooting advice and so on.
Did you try to connect the drive alone? If it is detected alone,
It seems to me that there's some confusion on your part about what a
SATA power connector is...
The SATA edge connector is divided in two parts, a larger one and a
narrower one. The narrower one is the signal, or data, connector. The
larger one is the power connector.
Some older drives also
that I am running CentOS-6.5 on my HP MicroServer.
Can you please tell us which exact model of MicroServer do you have?
That way, it will be easier to help you.
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I just checked the mirrors this morning and nothing has shown up for 6.4.
That's strange! Yesterday I've seen it in a few mirrors, including a
couple here in Portugal.
As an example:
ftp://ftp.dei.uc.pt/pub/linux/CentOS/6.4/
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the problem with that is when your boot drive dies your can't boot...with
ubuntu at least if any drive dies i can stilll boot off of the other 3..:)
You don't need a boot drive, you only need a *boot partition*.
So, you create a small *boot partition* with RAID1 and then allocate the
rest of
i then have to redo my entire array...and loose space inside the
array. Plus if i raid1 it then i only have two bootable disks..at
least this way i have 4 bootable disks..:)
Lose space? 100 or 200MB? Why the heck wouldn't you be able to spare 100
or 200MB of the gigantic size of today's
Plus if i raid1 it then i only have two bootable disks..at least
this way i have 4 bootable disks..:)
No, you don't have 4. Please study the way a RAID10 array works.
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A few months ago I had an enormous amount of grief trying to understand
why a RAID array in a new server kept getting corrupted and suddenly
changing configuration. After a lot of despair and head scratching it
turned out to be the SATA cables. This was a rack server from Asus with
a SATA
pfsense for a newbie?
Yup! Based on the simple requirements that the OP expressed, i.e. a
firewall for the whole network in my place, I would again recommend
pfsense. It may seem paradoxical but it's not. It just *works* after a
very simple and quick installation. The user only has to answer
pfsense for a newbie?
A CentOS-like firewall would be ClearOS (formerly Clarkconnect) and again
would reduce the number of simultaneously-learned layers to wade through.
While it works very well, it is yet another layer and difference to learn,
and when learning is is really good to not
Why does it have to be CentOS? If you want a wonderful router/firewall
that you can have up and running in a few minutes, you should look at this:
www.pfsense.org
I quote from their website:
pfSense is a free, open source customized distribution of FreeBSD
http://www.freebsd.org tailored for
For a newbie one like me ... which option you would advise me to go for?
I do not have any special preferences but I do care for the one that
is more stable and provide really more security.
It seems to me that the last line of my previous post already contained
my answer to your question
Now the machine is not particularly powerful: it is 64-bit machine, dual
core CPU, 3 GB RAM. So perhaps this is a factor in why I am having the
following problem: once in awhile that XFS partition starts generating
multiple I/O errors, files that had content become 0 byte, directories
Correction to the above: the XFS partition is 26TB, not 16 TB (not that it
should matter in the context of this particular situation).
Yes, it does matter:
Read this:
*[CentOS] 32-bit kernel+XFS+16.xTB filesystem = potential disaster*
uname -a
Linux nrims-bs 2.6.18-274.12.1.el5xen #1 SMP Tue Nov 29 14:18:21 EST
2011 x86_64 x86_64 x86_64 GNU/Linux
this is clearly a 64-bit OS so the 32-bit limitations ought not to apply.
Ok! Since you didn't inform us in your initial post, I thought I should
ask you in order to
Nevertheless, it seems to me that you should have more than 3GB of RAM
on a 64 bit system...
Since the width of the binary word is 64 bit in this case, 3GB
correspond to 1.5GB on a 32 bit system...
If you have a 64 bit system you should give it space to work properly.
Nevertheless, it seems to me that you should have more than 3GB of RAM
on a 64 bit system...
Since the width of the binary word is 64 bit in this case, 3GB
correspond to 1.5GB on a 32 bit system...
If you have a 64 bit system you should give it space to work properly.
... and the fact that
You are right - it would indeed be desirable to have more than 3 GB of
RAM on that system. However it is not obvious to me that having that
little RAM should cause I/O failure? Why? That it would make the
machine slow is to be expected - and especially so given that I had to
jack the
I want to build a dedicated firewall/router as I am launching a NPO and I can
host this in my garage. (Comcast offered me a 100 x 20 circuit for $99/mo
with 5 statics)
Thoughts, opinions, suggestions are welcome as to what to do!
http://www.pfsense.org/
Anyone have an update tutorial/howto for samba to authenticate to ldap?
http://www.samba.org/samba/docs/man/Samba-Guide/happy.html
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What I'm left wondering is:
1) Why you are relying on PATH expansion for this from something as
critical as a cron job. It is good sysadmin practice to specify
explicit paths for situations like this rather than to worry about
whether or not there is a good or valid reason for there
(...) I am hoping that someone here can give me some pointers, or point me to
some clear
how-to's somewhere. Any help is appreciated. Thanks
Some good guides on virtualization and LVM reside here:
https://access.redhat.com/knowledge/docs/Red_Hat_Enterprise_Linux/
vmware also has some
I think that the most secure setup is to use both LDAPI (ldap
connections over Unix sockets) for connections inside the ldap server
and TLS for connections from everywhere else on the network. Plus, ldapi
connections are much faster than TCP connections.
Am I wrong?
You can use something like this Atom 525 dual core motherboard:
http://www.jetwaycomputer.com/NF99.html
Or this Atom C550 dual core board:
http://www.jetwaycomputer.com/NC9C.html
With the AD3INLAN-G daughterboard:
http://www.jetwaycomputer.com/Daughter_Board.html
This will give you 5
pci is a shared bus with a max of 2 gigabits. you'll see a gigabit but
never see two or more.
I am aware of that. But as I said it depends on your particular needs in
*concurrent* traffic. Although it cannot sustain simultaneous Gigabit
debits on all interfaces, i can sustain Gigabit
pci is a shared bus with a max of 2 gigabits. you'll see a gigabit but
never see two or more.
I am aware of that. But as I said it depends on your particular needs in
*concurrent* traffic. Although it cannot sustain simultaneous Gigabit
debits on all interfaces, i can sustain Gigabit bursts
I would defiantly stick with PCIe for 5 NICs. Additionally Realtek
NICs don't offer the best performance and their drivers are hit or
miss. The Supermicro board has Intel PCIe NICs onboard and a PCIe
expansion slot. This should give you full performance depending on the
Atom processor. It
The daughterboard I pointed to contains Intel 3 Gigabit chips.
Ooops, I meant *3 Intel Gigabit chips*.
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I'm assuming the OP is trying to save money. A firewall with 5xGbe
interfaces is going to thousands of dollars.
I was assuming the same. That's why I suggested the Jetway solution. I
is economic and works very well in many scenarios.
Not, of course, if you need *concurrent* Gigabit access on
I was assuming the same. That's why I suggested the Jetway solution. I
is economic and works very well in many scenarios.
Not, of course, if you need *concurrent* Gigabit access on several
interfaces. I stress *concurrent*
I built one of these to connect several vlans to a 24Mbit ADSL
Does it have to be 1RU ?
This one is 1U:
http://routerboard.com/pricelist.php?showProduct=98
13 Gigabit ports
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Ok, I won't argue with that; a it fails in this scenario overrides
a it works for me. I will add though, that were it got into the state
described above was where I was able to recover it by using the reset
button. You might want to try that next time instead of the cable
disconnect
Which is about $400, not counting cables, which are expensive.
Well, you said not thousands of dollars... And I bought the cables for
about 20 dollars each.
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That part isn't a function of the iPEPS, it's a function of your
KVM switch. So yes, I was thinking about models that do it with
a particular key stroke. I've used the D-Link DKVM-8E as a decent
low cost unit, although it has the tendancy to get confused during
a full power outage of your
Are there any KVM over IP switches that are not thousands of dollars?
Ideally a 3-4 port switch for a few hundred seems reasonable to me.
Try this 8-port one from LevelOne:
http://global.level1.com/Business-Products/KVM-Switches---Extenders/Rackmount-KVM-Switches/KVM-0831/421.html
It has an
I have rebuilt samba3x SRPM in Centos 5.5. The resultings RPM's are
nearly in triple size of the original RPMs. I have installed and
checked the binary files are stripped. What can result in such
difference in RPM sizes?
Debugging information not removed from binaries?
I think I did not say clearly. It is NOT application can use 4GB MAX. What
I say is HARDWARE(server) HAVE 64gb ram OR 128 gb ram but O.S. only
understand 16 GB.
That was clear from the beggining.
With that amount of RAM you should really use a 64 bit OS. Otherwise,
you will be doing a
I just built from source the Samba 3.5.6 RPM packages for CentOS
5.x/RHEL5.x.
I found some glitches in the included samba.spec file and I thought
someone else might benefit from my recent experience. The spec file for
RHEL/CentOS resides, on the sources tree, under
I have to get/set acls on a windows share by script.
I can mount the windows share by mount.cifs but I don't know how to
set/get acls... anyone could help me ?
thx so much.
You would benefit from posing this question to the Samba mailing list:
sa...@lists.samba.org
Do you want to set the
The reason why I (think I) need both is that many third party apps on
the server (PHP applications typically) do not easily manage StartTLS.
Meanwhile, having two different ports make it easier to manage via iptables.
You can also use StartTLS over the network and LDAPI (connection over
Are you aware that SSL on port 636 is now considered deprecated in favor
of START_TLS on port 389?
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Are you aware that SSL on port 636 is now considered deprecated in favor of
START_TLS on port 389?
No, I'm not (I actually thought that it was the other way round)
(...)
What are the pro and cons of both approaches?
Comments more than welcome
You can, as an example, consult the
Can you give us the output of tune4fs -l /dev/sdb ?
Does it show has_journal under Filesystem features?
If it doesn't, you can input the following:
tune4fs -o journal_data
The option journal_data fits the case in which you don't care about
the fastest speed but you put your focus on data
Below is the output from tune4fs. From what people are saying it
looks like et4 may not be the way to go.
What people are saying? So instead of understanding and solving some
issue you just jump wagon, maybe only to find some other issue there?
ext4 is stable and works perfectly. You just
Filesystem state: not clean
You should really look at that line and at why it is there.
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I was just a little worried at the response from Brent earlier quote
Don't play Russian Roulette and use ext4. .
Maybe he was referring to some old information dating back to the
development period.
ext4 has been declared stable by the kernel people. As a matter of fact
it is now the
The defaults are determined by /etc/mke2fs.conf. If you've modified or
removed that file, mkfs.ext4 will behave differently
On my CentOS 5.5 systems, defaults for ext4 reside on /etc/mke4fs.conf.
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And don't do it that way.
If you have a single drive failure with RAID 0+1 you've lost *all* of
your redundancy - one more failure and you are dead. If you create two
RAID1 sets and then strip them into a RAID0 you get pretty much the same
performance and space efficiency characteristics,
Mdraid10 actually allows for a 3 drive raid10 set. It isn't raid10 per say
but a raid level based on distributing copies of chunks around the spindles
for redundancy.
Isn't this what they call RAID 1e (RAID 1 Enhanced), which needs a
minimum of 3 drives?
This seems to me a much better
The raid1e type probably didn't exist when Neil Brown came up with the
algorithm.
You are probably right.
He should have patented it though...
Maybe...
Maybe he started out with the idea to create a raid10, but didn't want the
complexity of managing sub-arrays so decided just to
can someone clarify this? is there a command that shows whether a
filesystem is currently acl-enabled? and is the mount man page
simply incomplete in that respect? thanks.
tune2fs -l /dev/[hda1,sda1]
The values between [ ] are an example only. Replace, of course, with
your own
I don't quite understand why all this fuss about some DVD ISOs...
At least the Portuguese mirrors work very nicely...
Here's an example:
ftp://ftp.di.uminho.pt/pub/centos/5.5/
Regards
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This is not a Dell-specific BIOS hack. Dear child, ask your folks about
PCs. I think it was only this decade that PCs would actually boot
*without* a keyboard. EVERY PC EVER MADE before would not.
Nah! Every BIOS since I remember (at least from 1990) had a choice on
the first page, Standard
This is not a Dell-specific BIOS hack. Dear child, ask your folks about
PCs. I think it was only this decade that PCs would actually boot
*without* a keyboard. EVERY PC EVER MADE before would not.
Nah! Every BIOS since I remember (at least from 1990) had a choice on
the first page,
I have samba installed on my server, with a fileshare. When connecting to
samba, using windows, filesnames with (double quotes) in them become
gibberish on the windows client.
Since Windows doesn't allow double quotes in filenames, Samba doesn't
either.
Single quotes (') are allowed
Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
OpenSUSE) CentOS does not come with XFS support by default but rather
requires custom modifications after the install in order for you to be
able to support XFS on your CentOS machine? Just seems a little odd
given how much
It's not available in the installer since it's considered a technology
preview by Redhat.
... which causes no problem whatsoever. It is normally used for data
partitions, not system partitions.
One can install the OS and then create the necessary partitions with XFS.
The following NSA document provides very good information on the secure
configuration of Red Hat Enterprise Linux 5/CentOS 5.x:
Guide to the Secure Configuration of Red Hat Enterprise Linux 5
http://www.nsa.gov/ia/_files/os/redhat/rhel5-guide-i731.pdf
It goes through almost all the services
I want to CENTOS download side and tried to download CENTOS 5.5 X86_64 DVD
version. I can NOT find on any site
Somebody already answered to you, but I will repeat:
http://isoredirect.centos.org/centos/5/isos/x86_64/
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One more mirror with DVD ISOs, this one in Portugal:
ftp://ftp.di.uminho.pt/pub/centos/5.5/isos/x86_64/
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One more, also in Portugal:
http://mirrors.nfsi.pt/CentOS/5.5/isos/x86_64/
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ISOs here:
http://mirror.chpc.utah.edu/pub/centos/5.5/isos/x86_64/
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When I try to download, none of the mirrors in UK seems to have these
isos, nor in the nearby countries mirrors
Here in Portugal practically all the mirrors have them :-)
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I know it works because I just tested it and it survived the server's
reboot. I ran ulimit -a and the new value was there.
...from a login shell. If you don't have a login shell /etc/profile
isn't read on bash startup.
In my case, I am doing the change because of Samba. When you
I need to to change the ulimit to 16384(ulimit -n 16384) on boot on
Centos 5.4 64 bit. How do I do that? Been searching and have yet to
find a good answer. Tried to do it in rc.local but it appears to
happen to late there
In order to make the change permanent, add the following line to
I need to to change the ulimit to 16384(ulimit -n 16384) on boot on
Centos 5.4 64 bit. How do I do that?
After replying to you, I tested the solution I gave you and it didn't
work.
I found a working solution. I added the following line to /etc/profile:
ulimit -n 16384
This works as the
i am adding routr options with
route add -net xxx dev eth0
but when i reset computer it is not in netstat table anymore
In about five (5) seconds I found this on Google:
Adding Persistent Routes
http://www.centos.org/modules/newbb/viewtopic.php?viewmode=flattopic_id=1927forum=30
I suppose
Maybe this will help:
http://www.ibm.com/developerworks/lotus/library/ls-Certification_Authority/index.html
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Overall using CAT5 is a lot easier, just don't make the mistake of
thinking that it's ethernet. CAT5 just provides the wires, the
signaling is proprietary and would probably fry an ethernet port if
you plugged one in. I suggest using different color cables
specifically for the KVM
What you're referring to is accessing the KVM box itself via IP, which
the Aten does allow. What Aten *also* does is use CAT5 cable to link
the KVM switch to various adapters which plug into the server(s). It's
the signalling on those lines that Brian was referring to, not
remotely accessing
I just made a new CentOS 5.4 installation. The machine has an Intel
10/100 and an Intel GB on board, and a Broadcom GB card on a PCI-X (64
bit) slot. After the install finished, I noticed that the order and
naming of the Ethernet interfaces is totally screwed up. Under Network
Manager, the
As I recall my solution was to comment out the modprobe alias created
for the network cards (/etc/modprobe.conf) and then in
network-scripts, use the HWADDR in each config script. Make sure the
device=ethX matches the name of the file, if nothing else, for your
own sanity - since the OS
XFS is not stable on 32-bit systems. You should not use it there. You
need a 64-bit kernel.
Default for servers should be 64-bit now anyway. Not many reasons left
for a 32-bit system, and more and more 3. party applications have less
and less support for 32-bit platforms in general.
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