[linux-lvm] Long-term snapshots possible?

[Dale J. Stephenson]

On Tuesday, March 11, 2003, at 10:28  AM, Jason Smith wrote:
>
> My problem is, this does not currently look possible without a severe
> performance hit.  If a volume has, for example, five active snapshots,
> then the deltas seem to get written five times, once per snapshot 
> volume.
>
I posted a patch (in January?) to implement chained snapshots with 
LVM1, ensuring that a delta is only copied once, at most.  The downside 
is that the snapshots are no longer independent, and you can't remove a 
recent snapshot without invalidating all the older snapshots.  But it 
is more efficient.

I didn't keep the message, but I believe chained snapshots will be 
implemented in LVM2 sometime this year.

Dale J. Stephenson
dalestephenson at mac.com