Using High Availability Monitors (June 2003)

Monitoring Disk Resources
Creating Disk Monitoring Requests
Chapter 254
Resources to Monitor for Lock Disks
Lock disks are used as a tie-breaker in forming or reforming a cluster. If
the lock disk is unavailable during cluster formation, the cluster may fail
to reform. If you are using a lock disk with your cluster, you should
configure a monitoring request for that disk and send an alert to your
system management software if the lock disk is unavailable. Requests to
monitor the lock disk might look like those listed in Table 2-14:
The Repeat value in the Options will send an alert until the lock disk is
available.
You need to create a request on each node in the cluster. Because the bus
name and SCSI path to the lock disk may be different on each node, the
resource instance may have a different name. It is merely a different
path to the same lock disk.
Resources to Monitor for Root Volumes
In a high availability system, it is recommended that you mirror your
root volume, and have them on separate links in separate PVGs. Note
that the root volume should always be ACTIVE. Requests to monitor the
root volume might look like those listed in Table 2-15:
Table 2-14 Lock Disk Monitoring Requests
Resource
Monitoring Parameters
Notify Condition Option
/vg/vg02/pv_pvlink/c0t0d1 when value is >= BUSY REPEAT
Table 2-15 Root Volumes Monitoring Requests
Resource
Monitoring Parameters
Notify Condition Option
/vg/vg00/pv_pvlink/c0t0d0 when value is >= BUSY REPEAT
/vg/vg00/pv_pvlink/c1t0d0 when value is >= BUSY REPEAT
/vg/vg00/lv_summary when value is not
equal
UP RETURN