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Re: [linux-lvm] Doubts on Snapshots
- From: Larry Dickson <ldickson cuttedge com>
- To: LVM general discussion and development <linux-lvm redhat com>
- Subject: Re: [linux-lvm] Doubts on Snapshots
- Date: Wed, 4 Feb 2009 07:14:43 -0800
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
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