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List:       dm-devel
Subject:    Re: [dm-devel] Snapshot and sparse device
From:       Alasdair G Kergon <agk () redhat ! com>
Date:       2004-10-15 17:53:34
Message-ID: 20041015175334.GQ24242 () agk ! surrey ! redhat ! com
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On Tue, Oct 12, 2004 at 05:49:12PM +0200, Guillaume Lacôte wrote:
> 23 I read that snapshotting performs copy-on-write. 
If you write to the original device (/dev/zero) yes:
but the snapshot itself doesn't have to be read-only -
it can also be written to, making a sparse-device.

Alasdair
-- 
agk@redhat.com


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