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In a Storage Foundation VS setup, use I/O fencing to protect data on shared storage on Volume Server and Volume Client systems.
I/O fencing on Volume Server systems is supported in the Share Out mode, while Volume Client systems can implement I/O fencing in both the Volume Serving and Share Out modes.
I/O fencing can be implemented on Volume Server systems in the Share Out mode using fencing with disk groups.
Implement I/O fencing on Volume Client systems in a different way compared to the Volume Server systems. In SCSI-3 fencing, nodes race to get control of coordinator disks. In comparison, the Volume Client systems race to get control of a coordinator volume, which you create on a dedicated disk group on the SAN. You create different disk groups for data.
Note
You cannot use coordinator volume and coordinator disks together for I/O fencing on the same system or in the same cluster.