Symantec 5 Identifying disks to use as coordinator disks, Checking shared disks for I/O fencing

Configuring VCS clusters for data integrity 95

Preparing to configure disk-based I/O fencing

4Scan all disk drives and their attributes, update the VxVM device list, and reconfigure DMP with the new devices. Type:

# vxdisk scandisks

See the Veritas Volume Manager documentation for details on how to add and configure disks.

5To initialize the disks as VxVM disks, use one of the following methods:

■Use the interactive vxdiskadm utility to initialize the disks as VxVM disks. For more information see the Veritas Volume Managers Administrator’s Guide.

■Use the vxdisksetup command to initialize a disk as a VxVM disk.

vxdisksetup -i device_name

The example specifies the CDS format:

#vxdisksetup -i sdr

Repeat this command for each disk you intend to use as a coordinator disk.

Identifying disks to use as coordinator disks

After you add and initialize disks, identify disks to use as coordinator disks.

To identify the coordinator disks

1List the disks on each node.

For example, execute the following commands to list the disks:

# vxdisk list

2Pick three SCSI-3 PR compliant shared disks as coordinator disks.

Checking shared disks for I/O fencing

Make sure that the shared storage you set up while preparing to configure VCS meets the I/O fencing requirements. You can test the shared disks using the vxfentsthdw utility. The two nodes must have ssh (default) or rsh communication. To confirm whether a disk (or LUN) supports SCSI-3 persistent reservations, two nodes must simultaneously have access to the same disks. Because a shared disk is likely to have a different name on each node, check the serial number to verify the identity of the disk. Use the vxfenadm command with the -ioption. This