Using High Availability Monitors (June 2007)

Monitoring Disk Resources
Creating Disk Monitoring Requests
Chapter 2 55
Alerts need to be interpreted in relation to each other. In the table above,
you would get an alert when PVG_UP is true. Although all data is
available, the condition PVG_UP implies there are physical volumes that
are not functioning and need to be fixed. See Table 2-15. You may want to
examine lv/copies to see how many copies of data are accessible and
determine how urgently you need to repair the failures. For example, if
you have 3-way mirroring and only one copy of data is available, you may
want to correct the failure immediately to eliminate the single point of
failure. Table 2-13 is an example of how the HA Disk Monitor determines
whether data is available in a mirrored configuration with 5 disks on
each bus.
/vg/vg01/lv/copies/* when value is <= 1 RETURN
Table 2-12 EMS Alert Requests (Continued)
Resource
Monitoring Parameters
Notify Condition Option
Table 2-13 Example for Interpreting the pv_summary for Mirrored Disks
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 HA
Disk Monitor cannot conclude that
all data is available
SUSPECT
4-1 some data missing
DOWN
0 no data available