Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Table 16-2
DMP parameters that are tunable (continued)
DescriptionParameter
The time limit that DMP waits for a failed I/O request to
return before the device is marked as INSANE, I/O is avoided
on the path, and any remaining failed I/O requests are
returned to the application layer without performing any
error analysis.
The default value is 57600 seconds (16 hours).
See “Configuring the response to I/O failures” on page 185.
See “Configuring the I/O throttling mechanism” on page 186.
dmp_failed_io_threshold
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
541Performance monitoring and tuning
Tuning VxVM