Tom,
Check out the following URL. It should answer most [all?] of your questions about creating an iSCSI target using two CentOS boxes, Heartbeat, and DRBD.
http://www.pcpro.co.uk/realworld/82284/san-on-the-cheap.html
Hope this helps. -Ken
Ross,
I can use DRBD to mirror data between the two storage servers and iSCSI to export the block devices, but how will iSCSI cope with failure of one storage server?
Can I use heartbeat and CRM to failover the host IP and iSCSI target to the other storage server?
Regards, Tom
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