zfs discuss - Feb 2008 - Lost intermediate snapshot; incremental backup still possible?

I keep my system synchronized to a USB disk from time to time.  The script works
by sending incremental snapshots to a pool on the USB disk, then deleting those
snapshots from the source machine.

A botched script ended up deleting a snapshot that was not successfully received
on the USB disk.  Now, I''ve lost the ability to send incrementally
since the intermediate snapshot is lost.  From what I gather, if I try to send a
full snapshot, it will require deleting and replacing the dataset on the USB
disk.  Is there any way around this?
 
 
This message posted from opensolaris.org

Do you still have any snapshots on the original disk?  If so, you might be able
to rollback the filesystem on the USB disk to match the last available snapshot
and then run an incremental again?

If you''ve no snapshots left at all, I can''t imagine
there''s anything you can do other than a full send/receive.

Incidentally, why delete the snapshots?  Unless you change an awful lot of files
they don''t usually take up much space.
 
 
This message posted from opensolaris.org

I think so.  On your backup pool, roll back to the last snapshot that
was successfully received.  Then you should be able to send an incremental
between that one and the present.

Jeff

On Thu, Feb 07, 2008 at 08:38:38AM -0800, Ian wrote:
> I keep my system synchronized to a USB disk from time to time.  The script
works by sending incremental snapshots to a pool on the USB disk, then deleting
those snapshots from the source machine.
> 
> A botched script ended up deleting a snapshot that was not successfully
received on the USB disk.  Now, I''ve lost the ability to send
incrementally since the intermediate snapshot is lost.  From what I gather, if I
try to send a full snapshot, it will require deleting and replacing the dataset
on the USB disk.  Is there any way around this?
>  
>  
> This message posted from opensolaris.org
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