Disk Device Groups

Add this planning information to the "Disk Device Group Configurations Worksheet" in Sun Cluster 3.0 Release Notes.

You must configure all volume manager disk groups as Sun Cluster disk device groups. This configuration enables multihost disks to be hosted by a secondary node if the primary node fails. Consider the following points when planning 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 the exported device can be hosted by multiple nodes. 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. Refer to your volume manager documentation for instructions on mirroring.

For more information about disk device groups, refer to Sun Cluster 3.0 Concepts.