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Should I have more than one shared volume (LUN) on my storage device in a cluster?

This is similar to a recent question, but I think it is different.

 

If I have two volumes on the same SAN and two cluster nodes mounting one of the volumes, and I have all the VM guests on the same volume, and that volume dies, not the hosts, the underlying storage volume on my SAN (not the SAN, just the volume/iSCSI LUN), am I correct I lose all my VMs?

 

If that is correct, is there any reason I need more than one SAN volume for my VMs, instead of one giant disk volume, iSCSI LUN, mounted by the cluster nodes?  I can't think of a reason I need more than one volume as opposed to one big volume managed by the VMware clustering software.


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