[KLUG Members] Server Mirroring

[Adam Tauno WIlliams]

> The software I want to mirror is Novell GroupWise.
> I think I've found a solution. DRBD.
> This will create a virtual block device that will mirror the data between two servers.

But don't block devices exist below the locking layer?  Most engines
cache data, so if multiple engines are sharing the same block devices
and are not somehow aware of each other your data will probably be
turned into sticky-paste in short order.

Replication is not the problem,  replication+concurrency is the problem.

> This is below the file level.
> This coupled with HeartBeat should do the trick.

Doesn't groupwise offer some kind of 'forest' technology within itself?
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