HP Veritas Volume Manager 5.0 -UX 11i v3 Importing disk groups as shared, Forcibly importing a disk group, #vxdg -simport diskgroup, #vxdg -s -fimport diskgroup

Administering cluster functionality 423

Administering VxVM in cluster environments

Caution: The operating system cannot tell if a disk is shared. To protect data integrity when dealing with disks that can be accessed by multiple systems, use the correct designation when adding a disk to a disk group. VxVM allows you to add a disk that is not physically shared to a shared disk group if the node where the disk is accessible is the only node in the cluster. However, this means that other nodes cannot join the cluster. Furthermore, if you attempt to add the same disk to different disk groups (private or shared) on two nodes at the same time, the results are undefined. Perform all configuration on one node only, and preferably on the master node.

Importing disk groups as sharedNote: 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 groupYou can use the -foption 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

Note: After a forced import, the data on the volumes may not be available and some of the volumes may be in the disabled state.