Re: nfs+xfs - was Re: SL6.3 2.6.32-358.2.1.el6.x86_64 kernel panic

Mon, 18 Mar 2013 05:55:53 -0700

I've used XFS for over a decade now. Its the most reliable crash resistant filesystem I've ever used according to all my tests and experience. But I have had a few bad patches on older versions of RHEL (before RedHat started supporting it) where it didn't work well, but historicity its worked perfectly on every non reheat based distro.
By the way I know why the performance goes down on NFS4 its mostly due to the fact that it supports xattribs natively and ext3 does not unless you explicitly turn it on when you mount the file system.
By the way I currently have several production servers running gluster on top of XFS serving both gluster native and NFS 3 clients and in several clusters it works perfectly for me.
Oh and the earlier confusion Netapps are BSD UNIX boxes and just like Unix Linux can serve NFS volumes Netapp didn't invent NFS nor are they even the best implementation. Give me a linux box with a san or a good raid controller any day they are faster and in the case of a SAN the are cheaper to scale



-- Sent from my HP Pre3

On Mar 18, 2013 3:45 AM, Sergio Ballestrero <sergio.ballestr...@cern.ch> wrote:


On 18 Mar 2013, at 08:37, Steven Haigh wrote:

On 03/18/2013 06:34 PM, Nico Kadel-Garcia wrote:
On Mon, Mar 18, 2013 at 2:59 AM, Dr Andrew C Aitchison
<a.c.aitchi...@dpmms.cam.ac.uk> wrote:
On Sun, 17 Mar 2013, Nico Kadel-Garcia wrote:

Also, *why* are you mixing xfs and nfs services in the same
envirnment? And what kind of NFS and XFS servers are you using?


Out of curiosity, why not ?

In theory the choice of disk filesystem and network file sharing
protocol should be independent.

How different is the practice ?

I had some bad, bad experience with XFS and haven't used it since. It
completely destabilized my bulk storage environment: things may have
changed.

I've deliberately and effectively kept my file systems below the 16 TB
range and worked well with ext4. I've occasionally used larger scale
commercial storage serves such as NetApp's for larger NFS environments
since then.


I use XFS on a small RAID6 array (its 2Tb - not huge), and I mount it via NFS to other systems. I haven't had a kernel crash as yet.

We use XFS for some heavily loaded "buffer storage" systems, and we haven't had an issue - but no NFS there.
We also have an NFS server using XFS (mostly because of the "project quota" feature we needed on some shares) and that's also working fine with NFSv3, serving about 200 clients; NFSv4 performance on XFS is disappointing compared to ext3 but we are not in an hurry to migrate.

Cheers,
  Sergio

-- 
 University of Johannesburg, Physics Department
 ATLAS TDAQ sysadmin team - Office:75282 OnCall:164851






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