autoreminor

Turns on or off the automatic reminor functionality. A disk group cannot be imported if the device minor numbers of the disk group or its objects conflict with those of an existing disk group. When autoreminor is on, VxVM automatically assigns new minor numbers to a disk group if VxVM detects a conflict during an import. The disk group is then imported. The default value is on.

In some scenarios such as with NFS file systems, assigning new minor numbers may result in issues. In this case, set the tunable parameter to off'. When the autoreminor parameter is set to off', attempting to import a disk group with conflicting minor numbers will fail, even when you specify the force (-f) option. You must manually reminor the disk group before you can import the disk group.

same_key_for_alldgs

By default, CVM generates a unique fence key for each of the shared disk groups in the cluster. Some storage arrays have an upper limit on the number of unique keys that can be registered. When persistent reservation is used, CVM might reach the limit.

When this tunable is set to on, CVM generates the same key for shared disk groups that it creates or imports. Disk groups that are already imported when the tunable is set must be deported and re-imported before the changed value of the tunable takes effect.

The default value is off.

sharedminorstart

The starting number in the range used to assign device minor numbers in shared (CVM) disk groups. The default value is 33000.

storage_connectivity

A clusterwide tunable parameter that indicates the CVM tolerance to storage disconnectivity.

When the value is asymmetric (the default), CVM enables a node to join the cluster as long as the node has access to all of the disks through another node. Similarly, as long as at least one node can access the disks in a shared disk group, CVM can import the shared disk group.

When the value is resilient, CVM requires that a node must have access to all of the disks in a shared disk group before the node can join the CVM cluster. The connectivity is also required before a shared disk group can be imported.

With either setting, CVM handles access to the disk group configuration as long as at least one node has access to the disk group configuration.