VERITAS Volume Manager 4.1 Administrator's Guide

Administering Cluster Functionality

Administering VxVM in Cluster Environments

Chapter 10374

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 on two nodes at the same time, the results are undeﬁned. Perform

all conﬁguration on one node only, and preferably on the master node.

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: