Using Serviceguard Extension for RAC, 5th Edition, June 2007

Serviceguard Configuration for Oracle 10g RAC
Creating a Storage Infrastructure with LVM
Chapter 280
Creating RAC Volume Groups on Disk Arrays
The procedure described in this section assumes that you are using
RAID-protected disk arrays and LVM’s physical volume links (PV links)
to define redundant data paths from each node in the cluster to every
logical unit on the array.
On your disk arrays, you should use redundant I/O channels from each
node, connecting them to separate controllers on the array. Then you can
define alternate links to the LUNs or logical disks you have defined on
the array. If you are using SAM, choose the type of disk array you wish to
configure, and follow the menus to define alternate links. If you are using
LVM commands, specify the links on the command line.
The following example shows how to configure alternate links using
LVM commands. The following disk configuration is assumed:
8/0.15.0 /dev/dsk/c0t15d0 /* I/O Channel 0 (8/0) SCSI address 15 LUN 0 */
8/0.15.1 /dev/dsk/c0t15d1 /* I/O Channel 0 (8/0) SCSI address 15 LUN 1 */
8/0.15.2 /dev/dsk/c0t15d2 /* I/O Channel 0 (8/0) SCSI address 15 LUN 2 */
8/0.15.3 /dev/dsk/c0t15d3 /* I/O Channel 0 (8/0) SCSI address 15 LUN 3 */
8/0.15.4 /dev/dsk/c0t15d4 /* I/O Channel 0 (8/0) SCSI address 15 LUN 4 */
8/0.15.5 /dev/dsk/c0t15d5 /* I/O Channel 0 (8/0) SCSI address 15 LUN 5 */
10/0.3.0 /dev/dsk/c1t3d0 /* I/O Channel 1 (10/0) SCSI address 3 LUN 0 */
10/0.3.1 /dev/dsk/c1t3d1 /* I/O Channel 1 (10/0) SCSI address 3 LUN 1 */
10/0.3.2 /dev/dsk/c1t3d2 /* I/O Channel 1 (10/0) SCSI address 3 LUN 2 */
10/0.3.3 /dev/dsk/c1t3d3 /* I/O Channel 1 (10/0) SCSI address 3 LUN 3 */
10/0.3.4 /dev/dsk/c1t3d4 /* I/O Channel 1 (10/0) SCSI address 3 LUN 4 */
10/0.3.5 /dev/dsk/c1t3d5 /* I/O Channel 1 (10/0) SCSI address 3 LUN 5 */
Assume that the disk array has been configured, and that both the
following device files appear for the same LUN (logical disk) when you
run the ioscan command:
/dev/dsk/c0t15d0
/dev/dsk/c1t3d0
Use the following procedure to configure a volume group for this logical
disk:
1. First, set up the group directory for vg_ops:
# mkdir /dev/vg_ops
2. Next, create a control file named group in the directory
/dev/vg_ops, as follows: