Using High Availability Monitors (June 2003)

Monitoring Disk Resources

Rules for Using the HA Disk Monitor with ServiceGuard

Chapter 240

NOTE Make sure you edit lvmpvg to contain the correct link names in

/dev/dsk/

device

for that system.

Creating Volume Groups on Disk Arrays Using PV Links

If you will be monitoring volume groups that use mass storage on disk

arrays, you should use redundant I/O channels from each node, and

connect 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. Alternate links (known as PV links) to the same disk should be

assigned to different physical volume groups. In SAM, choose the type of

disk array you want to conﬁgure, and follow the menus to deﬁne

alternate links. Be sure to specify a different physical volume group for

each link to the same disk.

The following exampleshows how to conﬁgure alternate links using LVM

commands. In the example, 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 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 steps to conﬁgure a volume group for this logical disk:

1. First, set up the group directory for vgdatabase: