On Tue, Jun 02, 2009 at 11:44:11AM +0200, Tino Schwarze wrote:
> On Mon, Jun 01, 2009 at 06:15:52PM -0400, Stephane Rouleau wrote:
> 
> > Is the blockdevel-level rsync-like solution going to be something 
> > publicly available? 

We certainly intend to, but no guarantee it ever gets finished. Except for
implementation there's not that much work left, but we do it in our free
time.

It really seems strange something like that doesn't exist yet (and rsync
itself doesn't support blockdevices).

> blockdev-level rsync smells like drbd. I'm not sure whether it support
> such huge amounts of unsynchronized data, but it might just be a matter
> of configuration.

In fact, i'd say LVM should be able to do this: generate a blocklevel-diff
between two snapshots of the same volume, and create a new snapshot/volume
based on an old one + a diff. Eg. ZFS supports this using send/receive.
So far, i haven't read about support for such a feature.
On the other hand, i think i've read on this list that using zfs send/receive
for backuppc pools was very slow (but that's on a filesystem level, not
blockdev level).

Drdb might be a solution too - i haven't looked at it closely. It seems
more meant for high availability, probably it can be used for offsite-backup
too. It has support for recovery after disconnection/failure, so maybe you can
use it to keep older versions on a remote system by forcibly disconnecting the
nodes. I don't know how easy it would be to migrate a non-drdb volume either.
Anyone experience with this in combination with backuppc?

-- 
Pieter

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