VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 10, Administering Cluster Functionality
Administering VxVM in Cluster Environments
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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 meansthat more than onenode ina cluster can open
a volume simultaneously.
Displaying the Cluster Protocol Version
The following command displays the cluster protocol version running on a node:
# vxdctl list
This command produces output similar to the following:
Volboot file
version: 3/1
seqno: 0.19
cluster protocol version: 40
hostid: giga
entries:
You can also check the existing cluster protocol version using the following command:
# vxdctl protocolversion
This produces output similar to the following:
Cluster running at protocol 40