zfs/zpool upgrade required?

[krad]

On 4 May 2011 12:55, Jeremy Chadwick <freebsd at jdc.parodius.com> wrote:

> On Wed, May 04, 2011 at 01:02:56PM +0200, Robert Schulze wrote:
> > when upgrading from 8.0 to 8-STABLE, kernel and userland support new
> > versions of ZFS pool and filesystem.
> >
> > Is it _required_ to upgrade existing pools and filesystems or can
> > that be done anytime later?
>
> - It can be done later, though by not upgrading you lose the ability to
> use newer features.  For a list of what those are, refer to the
> official OpenSolaris docs.  See menu on left side, near bottom:
>
> http://hub.opensolaris.org/bin/view/Community+Group+zfs/whatis
>
> - Make sure to note that the pool version and the filesystem version are
> separate.  Some folks remember to "zpool upgrade" but not "zfs upgrade".
>
> - Remember that upgrading is one-way; you cannot roll back to an older
> version without destroying your pools.  If you're worried, do full
> backups beforehand.
>
> --
> | Jeremy Chadwick                                   jdc at parodius.com |
> | Parodius Networking                       http://www.parodius.com/ |
> | UNIX Systems Administrator                  Mountain View, CA, USA |
> | Making life hard for others since 1977.               PGP 4BD6C0CB |
>
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Generally in production i would leave it on the old pool version for a
while, until you are confident you are not having any issues. As previously
stated you can then roll back more easily. When you are happy upgrade the
pool.