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You can use VCS to make Volume Server and Volume Client systems highly-available. The Volume Servers can be made highly-available only in the Share-Out mode and the Volume Clients can be made highly-available in both the Volume Serving and Share Out modes.
SAN Volumes on Volume Client systems are made highly available using the SANVolume agent. This agent achieves high-availability of the SAN Volume by attaching, monitoring, and unattaching a SAN volume. You can configure this agent as part of a VCS service group. The SAN volumes must reside on storage arrays that support SCSI-3 persistent reservations.
SAN disk groups on Volume Server systems are made highly-available using the DiskGroup agent. This agent achieves high-availability of the SAN disk groups by importing, monitoring, and deporting the SAN disk groups as required. You need to set the DiskGroupType attribute of this agent to SAN for a Storage Foundation VS environment.
See the Veritas Cluster Server Bundled Agents Reference Guide for more information on these agents.