[lustre-discuss] backup zfs MDT or migrate from ZFS back to ldiskfs

[Stu Midgley]

we have been happily using 2.9.52+0.7.0-rc3 for a while now.

The MDT is a raidz3 across 4 disks.

On Fri, Jul 21, 2017 at 1:19 PM, Isaac Huang <he.huang at intel.com> wrote:

> On Fri, Jul 21, 2017 at 12:54:15PM +0800, Stu Midgley wrote:
> > Afternoon
> >
> > I have an MDS running on spinning media and wish to migrate it to SSD's.
> >
> >     Lustre 2.9.52
> >     ZFS 0.7.0-rc3
>
> This may not be a stable combination - I don't think Lustre officially
> supports 0.7.0-rc yet. Plus, there's a recent Lustre osd-zfs bug and
> its fix hasn't been back ported to 2.9 yet (to the best of my knowledge):
> https://jira.hpdd.intel.com/browse/LU-9305
>
> > How do I do it?
>
> Depends on how you've configured the MDT pool. If the disks are
> mirrored or just plan disks without any redundancy (i.e. not RAIDz),
> you can simply attach the SSDs to the hard drives to form or extend
> mirrors and then detach the hard drives - see zpool attach/detach.
>
> -Isaac
>



-- 
Dr Stuart Midgley
sdm900 at gmail.com
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