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

Table 15-2
DMP parameters that are tunable (continued)
DescriptionParameter
If the dmp_low_impact_probe is turned on,
dmp_probe_threshold determines the number of paths
to probe before deciding on changing the state of other
paths in the same subpath failover group.
The default value is 5.
dmp_probe_threshold
The maximum number of queued I/O requests on a
path during I/O throttling.
The default value is 40.
A value can also be set for paths to individual arrays
by using the vxdmpadm command.
See “Configuring the I/O throttling mechanism”
on page 191.
dmp_queue_depth
If the DMP restore policy is check_periodic, the
number of cycles after which the check_all policy
is called.
The default value is 10.
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_cycles
The interval attribute specifies how often the path
restoration thread examines the paths. Specify the
time in seconds.
The default value is 300.
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_interval
509Performance monitoring and tuning
Tuning VxVM