[linux-lvm] Inactive snapshot?

Alasdair G Kergon agk at uk.sistina.com
Tue Sep 16 07:25:02 UTC 2003

On Tue, Sep 16, 2003 at 02:42:18PM +0900, tester7 A. wrote:
> 1. Force active snapshot to be inactive and make it accessable.
> It seems like inactive snapshot are not accesable at all. Inactive snapshots 
> does not update the changes, but it holds the changes while it was active, 
> so old data might be usefull.

Unfortunately this is not possible: a snapshot LV holds copies of 
the *original* data the first time each part of the original device
changes; if this process was switched off, further changes to the origin
would appear as part of the snapshot and so you'd get a hybrid.

You should either make the snapshot LV big enough to hold all the
changes, or else take a complete copy of the volume elsewhere and
use that.

agk at uk.sistina.com

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