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Re: Linux filesystems was [Re: Debian cd supporting ext4.]

Aniruddha put forth on 7/27/2010 12:03 PM:
> On Tue, Jul 27, 2010 at 6:19 PM, Stan Hoeppner <stan@hardwarefreak.com>wrote:
>> Volkan YAZICI put forth on 7/27/2010 8:22 AM:
>>> You are missing a very important point: Durability to power failures.
>>> (Excuse me, but a majority of GNU/Linux users are not switched to a UPS
>>> or something.) And that's where XFS totally fails[1][2].
>>> [1]
>> http://linux.derkeiler.com/Mailing-Lists/Debian/2008-11/msg00097.html
>> ....
>>  a fantastic piece of FOSS into which many top-of-their-game
>> kernel engineers have put tens of thousands of man hours, striving to make
>> it
>> the best it can be--and are wildly succeeding.
>> That's was very informative, thanks. You got me curious and I will test XFS
> on my home system. To be honest I am still  little wary of using XFS in a
> production environment. For years now I have heard stories of power failures
> with catastrophic results when using XFS. Anyone who using XFS in
> a mission critical production environment? Anyone has experience with that?

How about, and this will probably shock many of you:

1. Kernel.org

All of Linux source, including what becomes the Debian kernel, and the kernels
of all other Linux distros, is served from XFS filesystems:

"A bit more than a year ago (as of October 2008) kernel.org, in an ever
increasing need to squeeze more performance out of it's machines, made the
leap of migrating the primary mirror machines (mirrors.kernel.org) to XFS. We
site a number of reasons including fscking 5.5T of disk is long and painful,
we were hitting various cache issues, and we were seeking better performance
out of our file system."

"After initial tests looked positive we made the jump, and have been quite
happy with the results. With an instant increase in performance and
throughput, as well as the worst xfs_check we've ever seen taking 10 minutes,
we were quite happy. Subsequently we've moved all primary mirroring
file-systems to XFS, including www.kernel.org , and mirrors.kernel.org. With
an average constant movement of about 400mbps around the world, and with peaks
into the 3.1gbps range serving thousands of users simultaneously it's been a
file system that has taken the brunt we can throw at it and held up

2. NASA Advanced Supercomputing Facility, NASA Ames Research Center
See my other post for details

3.  Industrial Light and Magic -- ILM
At one time ILM had one of the largest installed SGI SAN storage systems on
the planet, may have been _the_ largest, running XFS.  It backed their render
farm(s).  They don't currently have any render system info on their site that
I can find.  Given the number, size, and scope of their animation projects and
the size to which their rendering farm has grown, they may have very well
switched SAN vendors over the years.  I don't know if they still use XFS or
not.  I would think so given that they're working with multi hundred gigabyte
files daily.

Many, many others.  What you have to understand is that XFS has been around a
long long time, 17 years in both IRIX and Linux.  It's older than EXT2.  Back
before cheap Intel/AMD clusters took over the supercomputing marketplace, SGI
MIPS IRIX systems with XFS owned upwards of 30-40% of that market.  XFS in
various platforms and versions has been in government labs, corporations and
academia for over a decade.  At one time Prof Stephen Hawking had his own
"personal" 32 CPU SGI Origin 3800 for running cosmology calculations in order
to prove his theories.  It had XFS filesytems, as have all SGI systems since

Here's a list of organizations that have volunteered information to xfs.org.
It is by far not a complete list, and most of the major SGI customers with XFS
on huge SAN systems aren't listed.  Note NAS at NASA Ames isn't listed.



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