Symantec Veritas Cluster Server 5.0 Update 3, Installation Manual

Page: 99 / 176

Setting up disk-based I/O fencing manually
Make sure you completed the preparatory tasks before you set up I/O fencing.
Tasks that are involved in setting up I/O fencing include:
Table 5-1
Tasks to set up I/O fencing manually
Description Action
See “Setting up coordinator disk groups” on page 99. Setting up coordinator disk
groups
See “Creating I/O fencing configuration files” on page 100. Creating I/O fencing
configuration files
See “Modifying VCS configuration to use I/O fencing”
on page 101.
Modifying VCS configuration
to use I/O fencing
See “Verifying I/O fencing configuration” on page 102. Verifying I/O fencing
configuration
Setting up coordinator disk groups
From one node, create a disk group named vxfencoorddg. This group must contain
three disks or LUNs. If you use VxVM 5.0 or later, you must also set the coordinator
attribute for the coordinator disk group. VxVM uses this attribute to prevent the
reassignment of coordinator disks to other disk groups.
Note that if you create a coordinator disk group as a regular disk group, you can
turn on the coordinator attribute in Volume Manager.
Refer to the Veritas Volume Manager Administrator’s Guide for details on how to
create disk groups.
The following example procedure assumes that the disks have the device names
sdx, sdy, and sdz.
To create the vxfencoorddg disk group
1 On any node, create the disk group by specifying the device names:
#
vxdg init vxfencoorddg sdx sdy sdz
2 If you use VxVM 5.0 or later, set the coordinator attribute value as "on" for
the coordinator disk group.
#
vxdg -g vxfencoorddg set coordinator=on
99 Configuring VCS clusters for data integrity
Setting up disk-based I/O fencing manually