zfs/zpool upgrade

[Zaphod Beeblebrox]

2009/12/1 Gerrit Kühn <gerrit at pmp.uni-hannover.de>

>
> I have one question concerning zfs and zpool upgrades:
>
> Some time ago I saw some postings here with procedures to upgrade to newer
> zpool and zfs versions. These contained exporting and importing the pool
> (and upgrading in-between, of course :-).
> Is the export strictly neccessary? I have no machine where I could try it
> right now, but I think I did use zpool upgrade on imported and online
> pools before without noticing any problems.
>

I upgraded my ZFS pool and all that was required was "zpool upgrade"
followed by one "zfs upgrade" for each filesystem on the pool.  No
import/export was required.