[lustre-discuss] Questions about migrate OSTs from ldiskfs to zfs

Alexander I Kulyavtsev aik at fnal.gov
Tue Mar 1 09:18:43 PST 2016

Please see inlined.

On Feb 26, 2016, at 6:36 PM, Dilger, Andreas <andreas.dilger at intel.com<mailto:andreas.dilger at intel.com>> wrote:

On Feb 23, 2016, at 05:24, Fernando Perez <fperez at icm.csic.es<mailto:fperez at icm.csic.es>> wrote:

Hi all.
... snip...

- Dou you recommend to do a lustre update before replace the OSTs by the new zfs OSTs?

Lustre 2.4.1 is very old.  It makes sense to use a newer version than this, especially if you are using ZFS.

However, it is generally bad sysadmin practice to do major hardware and software updates at the same time, since it becomes very difficult to isolate any problems that appear afterward. I would recommend to upgrade to a newer version of Lustre (2.5.3, or what is recommended from your support provider) at least on the servers and run that for a week or two before doing the hardware upgrade.
is tag considered stable?

- I have read in the list that there are problem with the last zfsonlinux release and lustre only works with zfsonlinux 0.6.3. Is this right?

Newer versions of Lustre work well with ZFS, I don't remember anymore what ZFS versions were tested with 2.4.1. We had some problems under heavy load with and have moved back to for the Lustre 2.8.0 release until that is fixed.
We are, the last before
What is zfs ?

Cheers, Andreas

Best regards, Alex.

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