Using High Availability Monitors (June 2007)

Monitoring Disk Resources
HA Disk Monitor Reference
Chapter 2 33
Logical Volume Summary
The logical volume summary describes how accessible the data is in all
logical volumes in an active volume group. Sometimes the physical
connection may be working, but the application cannot read or write data
on the disk. The HA Disk Monitor determines I/O activity by querying
LVM, and marks a logical volume as DOWN if a portion of its data is
unavailable.
NOTE If the logical volume is in an inactive volume group, the HA Disk Monitor
cannot determine if the data can be accessible.
Table 2-3 lists how conditions compare in logical operations. You specify
the logical operation in the monitor request parameters portion of the
monitor request. For example, to create a request that alerts you when
the condition is INACTIVE_DOWN, you would specify greater than or equal
to 3 (>=3).
Table 2-3 Interpreting Logical Volume Summary
Resource Name: /vg/vgName/lv_summary
Condition Value Interpretation
UP 1 All logical volumes are accessible and all data
is accessible.