Cluster Server (VCS) supports disk groups and volume groups created on virtual SCSI devices. The VCS DiskGroup agent supports disk groups. The VCS LVMVG agent supports volume groups.

Due to lack of SCSI3 persistent reservations, I/O Fencing is not supported with virtual SCSI devices.

If fencing is enabled and private diskgroups created on virutal SCSI devices are configured under VCS, then Reservation attribute should be defined and set to NONE for these diskgroups.

The command to set the value of Reservation attribute to None is:

#hares -modify <dg_res> Reservation "None"