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

Table 15-2
DMP parameters that are tunable (continued)
DescriptionParameter
The DMP restore policy, which can be set to one of
the following values:
■ check_all
■ check_alternate
■ check_disabled
■ check_periodic
The default value is check_disabled.
The value of this tunable can also be set using the
vxdmpadm start restore command.
See “Configuring DMP path restoration policies”
on page 194.
dmp_restore_policy
If an inquiry succeeds on a path, but there is an I/O
error, the number of retries to attempt on the path.
The default value is 5.
A value can also be set for paths to individual arrays
by using the vxdmpadm command.
See “Configuring the response to I/O failures”
on page 189.
dmp_retry_count
Determines the timeout value to be set for any SCSI
command that is sent via DMP. If the HBA does not
receive a response for a SCSI command that it has
sent to the device within the timeout period, the SCSI
command is returned with a failure error code.
The default value is 60 seconds.
dmp_scsi_timeout
Determines the minimum number of paths that should
be failed in a failover group before DMP starts
suspecting other paths in the same failover group.
The value of 0 disables the failover logic based on
subpath failover groups.
The default value is 1.
dmp_sfg_threshold
The time interval between gathering DMP statistics.
The default and minimum value are 1 second.
dmp_stat_interval
Performance monitoring and tuning
Tuning VxVM
510