Erik Trimble wrote:
You are correct in that restoring a full stream creates the appropriate
versioned filesystem. That's not the problem.
The /much/ more likely scenario is this:
(1) Let's say I have a 2008.11 server. I back up the various ZFS
filesystems, with both incremental and full streams off to tape.
(2) I now upgrade that machine to 2009.05, and upgrade all the zpool/zfs
filesystems to the later versions, which is what most people will do.
(3) Now, I need to get back a snapshot from before step #2. I don't
want a full stream recovery, just a little bit of data. I now am in the
situation that I have a current (active) ZFS filesystem which has a
later version than the (incremental) stream I stored earlier.
This is what a typical recover instance is. If I can't recover an
incremental into an existing filesystem, it effectively means my backups
are lost and useless. (not quite true, but it creates a huge headache.)
Ummm... but you can't recover that incremental anyway, unless you have the fs
snapshot from which the incremental was derived. And that snapshot, by
definition, is a compatible zfs fs version. Unless "zfs upgrade" touches
snapshots? Which would be... odd...
--
Carson
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