[lustre-discuss] Upgrading Lustre+ZFS

[Dilger, Andreas]

On Apr 6, 2017, at 09:24, Riccardo Veraldi <Riccardo.Veraldi at cnaf.infn.it> wrote:
> 
> Hello,
> 
> I plan to upgrade both my MDS and OSS server which are now RHEL72 Lustre
> 2.8.0 + ZFS 0.6.5.8 to RHEL73 Lustre 2.9.0 and ZFS 0.6.5.9.
> I plan to first upgrade the MDS then the OSS server.
> Is there any risk to lose data ?
> My idea was to shut down lustre and upgrade the operating system and
> then ZFS. Then upgrade lustre.

This should be fine.  The on-disk format of Lustre is upward compatible.

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation