Introducing Arcserve Backup Agents and Options › Using Options › Disaster Recovery Option › Recovering NEC Clusters › Disaster Recovery Requirements › Requirements for NEC CLUSTERPRO/ExpressCluster Shared Disks

Requirements for NEC CLUSTERPRO/ExpressCluster Shared Disks

You must satisfy the following minimum requirements for the NEC CLUSTERPRO/ExpressCluster Shared Disk:

• All shared disks, including the cluster disk, shared disk, and switched disk, must be physically attached to a shared bus.
• Disks attached to the shared bus must be visible from all nodes. To verify this at the host adapter setup level, see the manufacturer’s documentation for adapter-specific instructions.
• SCSI devices must be assigned unique SCSI identification numbers and properly terminated, as per manufacturer’s instructions.
• All shared disks must be configured as basic (as opposed to dynamic).

Note: We recommend the use of fault-tolerant RAID configurations (for example, RAID level 5) for all disks, rather than stripe sets without parity (for example, RAID level 0), although this is not a shared disk requirement.