[linux-lvm] Long-term snapshots possible?
Heinz J . Mauelshagen
mauelshagen at sistina.com
Wed Mar 12 06:27:00 UTC 2003
On Tue, Mar 11, 2003 at 04:38:03PM -0500, Dale J. Stephenson wrote:
>
> 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.
Yes they will show up in LVM2 later.
FYI: LVM1 is in feature freeze since last year.
>
> Dale J. Stephenson
> dalestephenson at mac.com
>
>
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--
Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Sistina Software Inc.
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56242 Marienrachdorf
Germany
Mauelshagen at Sistina.com +49 2626 141200
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