Symantec 5 Setting up disk-based I/O fencing manually, Setting up coordinator disk groups

Configuring VCS clusters for data integrity 99

Setting up disk-based I/O fencing manually

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
Action		Description
Setting up coordinator disk		See “Setting up coordinator disk groups” on page 99.
groups
Creating I/O fencing		See “Creating I/O fencing configuration files” on page 100.
configuration files
Modifying VCS configuration		See “Modifying VCS configuration to use I/O fencing”
to use I/O fencing		on page 101.
Verifying I/O fencing		See “Verifying I/O fencing configuration” on page 102.
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

1On any node, create the disk group by specifying the device names:

# vxdg init vxfencoorddg sdx sdy sdz

2If 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