There's this article<http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-dont-do-that/>that says that you shouldn't ever do iSCSI multipath to multiple iSCSI targets on top of the same DRBD volume. Can someone tell me whether that is a limitation of DRBD, and that Ceph would perform correctly in such a situation? Another obstacle in such an active-active setup would be communicating state information between the copies of iSCSI target software, such as SCSI Persistent Reservations.
Can anyone think of any other obstacles to running an active-active iSCSI cluster on top of Ceph?
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