Using High Availability Monitors (June 2007)

Monitoring Disk Resources
Rules for Using the HA Disk Monitor with ServiceGuard
Chapter 238
NOTE HA Monitor supports only the LVM multi-path technology with
diskmond monitoring. The other multipath technologies such as EMC
Powerpath, Autopath and Securepath are not supported.
Setting Failover Parameters
When using the HA Disk Monitor with ServiceGuard, the parameters
listed in Table 2-6 should be set so that a package failover will occur
when access to a disk resource fails.
Working with Physical Volume Groups
The pv_summary is calculated based on the compiled results of SCSI
inquiries to all physical volumes in a volume group. To help you
determine the best way to configure your disks for monitoring, here are
the assumptions made by the monitor when calculating pv_summary:
• PVGs (physical volume groups) are set up to be bus-specific sides of a
mirror or redundant links, PVGs have an equal number of physical
volumes.
• All logical volumes within a volume group are mirrored in the same
way: all 2-way or all 3-way mirroring.
• If you are configuring a monitoring request through ServiceGuard, a
package depends on all logical volumes in the volume group.
• The SCSI inquiry will retry on devices that are BUSY. BUSY devices
are not considered UP when calculating pv_summary.
Table 2-6 Setting Failover Parameters
Parameter Setting Notes
RUN_SCRIPT_
TIMEOUT
non-zero
timeout value
Do not leave these parameters
set to the default, NO_TIMEOUT. If
you do, the run or halt script
hangs the package and will not
proceed with its action.
HALT_SCRIPT_
TIMEOUT
non-zero
timeout value