[dm-devel] [RFC] dm snapshot based asynchronous replication

[Lars Ellenberg]

On Wed, Apr 15, 2009 at 08:31:44PM +0200, christophe.varoqui at free.fr wrote:
> > Should I understand there's no way for userspace to extract from the device mapper the cow'ed chunk list of a vanilla snapshot ?
> 
> Replying to myself, I found an instructive post from Lars of the drdb folks : http://markmail.org/message/7qdbp36tohasojuy (thanks for sharing Lars)
> 
> This script is easy enough to morph from its original snapshot reverting purpose to the replication model using the cow device as a changelog I described.
> 
> Thanks for the inputs. I'll keep posting if I something of general interest comes out of this stuff.

that perl hack was meanwhile ported to C by someone.
posted earlier this year on dm-devel.
also please do not ignore the Zumastor work.

-- 
: Lars Ellenberg
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