Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Table 15-2
DMP parameters that are tunable (continued)
DescriptionParameter
Determines whether DMP listens to disk-related
events from the Event Monitoring framework (EVM)
on HP-UX.
The default is on.
If this parameter is set to on, DMP listens and reacts
to events from EVM.
If the parameter is set to off, DMP stops listening
and reacting to events.
dmp_evm_handling
Whether DMP should try to obtain SCSI error
information directly from the HBA interface. Setting
the value to on can potentially provide faster error
recovery, provided that the HBA interface supports
the error enquiry feature. If this parameter is set to
off, the HBA interface is not used.
The default setting is off.
dmp_fast_recovery
DMP detects intermittently failing paths, and prevents
I/O requests from being sent on them. The value of
dmp_health_time represents the time in seconds
for which a path must stay healthy. If a path’s state
changes back from enabled to disabled within this
time period, DMP marks the path as intermittently
failing, and does not re-enable the path for I/O until
dmp_path_age seconds elapse.
The default value is 60 seconds.
A value of 0 prevents DMP from detecting
intermittently failing paths.
dmp_health_time
505Performance monitoring and tuning
Tuning VxVM