Adhering to Quorum Device Requirements

Ensure that Sun Cluster software supports your specific device as a quorum device. If you ignore this requirement, you might compromise your cluster's availability.

For a list of the specific devices that Sun Cluster software supports as quorum devices, contact your Sun service provider.

Sun Cluster software supports the following types of quorum devices:

• Multihosted shared disks that support SCSI-3 PGR reservations.

• Dual-hosted shared disks that support SCSI-2 reservations.

• A Network-Attached Storage (NAS) device from Sun Microsystems, Incorporated or from Network Appliance, Incorporated.

• A quorum server process that runs on the quorum server machine.

• Any shared disk, provided that you have turned off fencing for this disk, and are therefore using software quorum. Software quorum is a protocol developed by Sun Microsystems that emulates a form of SCSI Persistent Group Reservations (PGR).

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  Caution –

  If you are using disks that do not support SCSI, such as Serial Advanced Technology Attachment (SATA) disks, turn off fencing.

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You cannot use a replicated device as a quorum device.

In a two–host configuration, you must configure at least one quorum device to ensure that a single host can continue if the other host fails. See Figure 3–2.

For examples of quorum configurations to avoid, see Bad Quorum Configurations. For examples of recommended quorum configurations, see Recommended Quorum Configurations.