Carson Gaspar wrote:
Erik Trimble wrote:
> I haven't see this specific problem, but it occurs to me thus:
For the reverse of the original problem, where (say) I back up a 'zfs
send' stream to tape, then later on, after upgrading my system, I
want to get that stream back.
Does 'zfs receive' support reading a version X stream and dumping it
into a version X+N zfs filesystem?
If not, frankly, that's a higher priority than the reverse.
Your question confuses me greatly - am I missing something? "zfs recv"
of a full stream will create a new filesystem of the appropriate
version, which you may then "zfs upgrade" if you wish. And restoring
incrementals to a different fs rev doesn't make sense. As long as
support for older fs versions isn't removed from the kernel, this
shouldn't ever be a problem.
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.)
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
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