1.4.9 Disk Reservation

This section is applicable for two-node configurations only.

As part of failure fencing, Sun Cluster reserves shared disks when only one node is active. This prevents "rogue" hosts from accessing the shared disks. When this happens, the command vxdisk list on a node that has left the cluster may show all disks on such a controller as having an error status. The more detailed options of vxdisk will show the flag unavailable. When a new node joins the cluster, the Sun Cluster software releases the controllers. CVM attempts to access these disks, and if that is successful, the disks return to an online status. If one system boots while the other system has the disks reserved, the disks may be invisible to the booting system, and vxdisk may display none of the shared disks. When the system joins the cluster, the shared disks become visible.