Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

153Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
The interval attribute specifies how often the path restoration thread examines the paths.
For example, after stopping the path restoration thread, the polling interval can be set to
400 seconds using the following command:
# vxdmpadm start restore interval=400
Note: The default interval is 300 seconds. Decreasing this interval can adversely affect
system performance.
To change the interval or policy, first stop the path restoration thread as described in
“Stopping the DMP path restoration thread” on page 153, and then restart it with new
attributes.
See the vxdmpadm(1M) manual page for more information about DMP restore policies.
Stopping the DMP path restoration thread
Use the following command to stop the DMP path restoration thread:
# vxdmpadm stop restore
Note: Automatic path failback stops if the path restoration thread is stopped.
Displaying the status of the DMP path restoration thread
Use the following command to display the status of the automatic path restoration kernel
thread, its polling interval, and the policy that it uses to check the condition of paths:
# vxdmpadm stat restored
This produces output such as the following:
The number of daemons running : 1
The interval of daemon: 300
The policy of daemon: check_disabled
Displaying information about the DMP error-handling thread
To display information about the kernel thread that handles DMP errors, use the following
command:
# vxdmpadm stat errord
One daemon should be shown as running.