VERITAS Volume Manager 4.1 Administrator's Guide

Administering Cluster Functionality

Administering VxVM in Cluster Environments

Chapter 10378

When using the vxassist command to create a volume, you can use the

exclusive=on attribute to specify that the volume may only be opened

by one node in the cluster at a time. For example, to create the mirrored

volume volmir in the disk group dskgrp, and conﬁgure it for exclusive

open, use the following command:

# vxassist -g dskgrp make volmir 5g layout=mirror

exclusive=on

Multiple opens by the same node are also supported. Any attempts by

other nodes to open the volume fail until the ﬁnal close of the volume by

the node that opened it.

Specifying exclusive=off instead means that more than one node in a

cluster can open a volume simultaneously.

Setting Exclusive Open Access to a Volume by a Node

NOTE Exclusive open access on a volume can only be set on the master node.

Ensure that none of the nodes in the cluster have the volume open when

setting this attribute.

You can set the exclusive=on attribute with the vxvol command to

specify that an existing volume may only be opened by one node in the

cluster at a time.

For example, to set exclusive open on the volume volmir in the disk

group dskgrp, use the following command:

# vxvol -g dskgrp set exclusive=on volmir

Multiple opens by the same node are also supported. Any attempts by

other nodes to open the volume fail until the ﬁnal close of the volume by

the node that opened it.

Specifying exclusive=off instead means that more than one node in a

cluster can open a volume simultaneously.

Displaying the Cluster Protocol Version

The following command displays the cluster protocol version running on

a node: