Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

411Administering cluster functionality

Administering VxVM in cluster environments

Forcibly adding a disk to a disk group

Note: Disks can only be forcibly added to a shared disk group on the master node.

If VxVM does not add a disk to an existing disk group because that disk is not attached to

the same nodes as the other disks in the disk group, you can forcibly add the disk using the

following command:

# vxdg -f adddisk -g diskgroup [diskname=]devicename

Caution: Only use the force option(-f) if you are fully aware of the consequences such as

possible data corruption.

Importing disk groups as shared

Note: Shared disk groups can only be imported on the master node.

Disk groups can be imported as shared using the

vxdg -s import command. If the disk

groups are set up before the cluster software is run, the disk groups can be imported into

the cluster arrangement using the following command:

# vxdg -s import diskgroup

where diskgroup is the disk group name or ID. On subsequent cluster restarts, the disk

group is automatically imported as shared. Note that it can be necessary to deport the disk

group (using the

vxdg deport diskgroup command) before invoking the vxdg utility.

Forcibly importing a disk group

You can use the -f option to the vxdg command to import a disk group forcibly.

Caution: The force option(-f) must be used with caution and only if you are fully aware

of the consequences such as possible data corruption.

When a cluster is restarted, VxVM can refuse to auto-import a disk group for one of the

following reasons:

■ A disk in the disk group is no longer accessible because of hardware errors on the

disk. In this case, use the following command to forcibly reimport the disk group:

# vxdg -s -f import diskgroup

■ Some of the nodes to which disks in the disk group are attached are not currently in

the cluster, so the disk group cannot access all of its disks. In this case, a forced

import is unsafe and must not be attempted because it can result in inconsistent

mirrors.