Using EMS HA Monitors

Chapter 2 55
Monitoring Disk Resources
Creating Disk Monitoring Requests
Table 2-9 Example for Interpreting the pv_summary for Mirrored Disks
Resources to Monitor for Lock Disks
Lock disks are used as a tie-breaker in a forming or reforming cluster, so if you are
using a lock disk with your cluster, you should request a monitor for that disk and
send an alert to your system management software if the lock disk is unavailable. If
the lock disk is unavailable during cluster formation, the cluster may fail to reform.
Requests to monitor the lock disk might look like this:
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.
number of
valid
devices
meaning
pv_summary
value
10 all PVs and data accessible UP
9 1 PV down, all data accessible PVG_UP
8-5 if 5 PVs are from the same PVG, then all data is available PVG_UP
if 2 or more physical volumes from different PVGs are DOWN,
the disk monitor cannot conclude that all data is available
SUSPECT
4-1 some data missing
DOWN
0 no data available
Resource
Monitoring Parameters
Notify Condition Option
/vg/vg02/pv_pvlink/c0t0d1 when value is >=
BUSY RETURN