Add this planning information to the “Disk Device Groups Worksheet” in Sun Cluster 3.1 Release Notes.
You must configure all volume manager disk groups as Sun Cluster disk device groups. This configuration enables a secondary node to host multihost disks if the primary node fails. Consider the following points when you plan disk device groups.
Failover – You can configure multiported disks and properly-configured volume manager devices as failover devices. Proper configuration of a volume manager device includes multiported disks and correct setup of the volume manager itself so that multiple nodes can host the exported device. You cannot configure tape drives, CD-ROMs, or single-ported disks as failover devices.
Mirroring – You must mirror the disks to protect the data from disk failure. See Mirroring Guidelines for additional guidelines. See Installing and Configuring Solstice DiskSuite/Solaris Volume Manager Software or Installing and Configuring VxVM Software and your volume manager documentation for instructions on mirroring.
For more information about disk device groups, see the Sun Cluster 3.1 Concepts Guide.