From: Alex Dean <
alex@crackpot.org>
> On Apr 9, 2012, at 11:42 PM, Stephen wrote:
>> ok here is something i haven't considered in this way.
>> Openfiler with drbd
> drbd is great if both cluster nodes are in the same data center.
> Over the internet… not so much. The latency will kill your
> performance. Check it out for your scenario, though. If you have
> the right pre-requisites, drbd is pretty great.
However, DRBD is basically "replicate one block device to one other block
device". There's not much support for 3-node setups. (Stacked resources
allow you to do this, but it looks like a total pain.) Also, DRBD's
dual-primary mode will only work right if multicast is enabled on your network
and you're using OCFS2 or GFS2 on the device and running the distributed lock
manager. OCFS2/GFS2 are slower than ext3 because of locking/replication/the
paranoia of making sure everything's always consistent on both nodes.
I'd say that a solution would probably involve regular rsyncs instead of DRBD,
given that the original post mentioned multiple sites.
--
Matt G / Dances With Crows
The Crow202 Blog:
http://crow202.org/wordpress/
There is no Darkness in Eternity/But only Light too dim for us to see
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