On Thu, Jan 08, 2009 at 04:04:55PM -0500, Tom Georgoulias wrote:
> Renames *were* hard--I never got that working so I gave up.  I was 
> encouraged to see your suggestion of a user-defined properties, I was 
> trying to use them to get around the renaming problem and wasn't sure if 
> that was too much of a brute force approach.

Thinking about it, user-defined properties are probably the right place
to store backup status (i.e., whether this snapshot was backed up, when
was the last time this dataset was backed up, ...).

Might as well add a snapshot ID (monotonically increasing is fine, UUID
is better), and use that for rename detection.

Deletion of the last backed up snapshot should be discouraged, since
recovering from that requires a bigger zfs send to the backup pool.

Nico
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