[linux-lvm] Doubts on Snapshots

Larry Dickson ldickson at cuttedge.com
Wed Feb 4 15:14:43 UTC 2009

This is a misunderstanding of what snapshot does. To minimize copying, it
makes a special volume containing the OLD versions of only those sectors
CHANGED since the snap was made. Thus, when mated with the original,
continually-being-updated volume, it can reconstruct its state at the time
of the snap. Without the original, it cannot do much.

I think what you want is mirroring or rsync.

Larry Dickson
Cutting Edge Networked Storage

On 2/4/09, Rahul Baheti <rahulbaheti86 at gmail.com> wrote:
> I have connected a pen drive and make a logical volume from it. then i take
> a snapshot of this logical volume and the snapshot logical volume lies in
> hard disk. After that i plugged out the pen drive. Without pen drive being
> plugged into the system can i recover the data of pen drive using the
> snapshot volume.
> Waiting for reply
> Thanks and Regards
> Rahul Baheti
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> linux-lvm at redhat.com
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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