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As part of its quorum control, the Sun Java System Cluster cluster manager reserves shared disk controllers when only one node is active. This prevents "rogue" hosts from accessing the shared disks. When this happens, the vxdisk list command used 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 the vxdisk command show the flag unavailable. When a new node joins the cluster, the Sun Java System Cluster software releases the controllers. VxVM attempts to access these disks, and if that is successful, the disks return to an online status. (See the Sun Java System Cluster documentation for further details.) If one system boots while the other system has the disks reserved, the disks can be invisible to the booting system, and the vxdisk command may not display any of the shared disks. When the system joins the cluster, the shared disks become visible.