[Linux-cluster] Mirror Volume Pairs

[Maciej Bogucki]

> I am purchasing the equipment to attempt a configuration I found here:
> 
> http://www.redhat.com/magazine/008jun05/features/gfs/#fig-mirroring
> 
> How does GNBD able to export the mirrored drives?  How would the mirror be
> created?  If gnbd exports a local device, lets call it /dev/md0, how does
> the local drive actually get mirrored from the drive of the second
> machine?
> 
> I haven't been able to locate too much information on this mirror volume
> pairs, is there a document anywhere that could explain the setup?
> 
> The goal is to get two machines, each with two 500 Gig drives to use gnbd
> multipath to export their local drives as a single source...thus there
> would be failover just as described in the document.

Hello,

Use drbd [1] to mirror two block device via network. Then use GNBD or
iSCSI to export DRBD device to group of servers. If You need automatic
failover You could use heartbeat [2] or RHCS [3]

[1] - http://www.drbd.org/
[2] - http://www.linux-ha.org/
[3] - http://www.redhat.com/software/rha/cluster/

Best Regards
Maciej Bogucki