VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

DMP in a Clustered Environment
104 VERITAS Volume Manager Administrator’s Guide
Note To change the interval or policy, you must first stop the restore daemon, and then
restart it with new attributes.
See the vxdmpadm(1M) manual page for more information about DMP restore policies.
Stopping the DMP Restore Daemon
Use the following command to stop the DMP restore daemon:
# vxdmpadm stop restore
Note Automatic path failback stops if the restore daemon is stopped.
Displaying the Status of the DMP Restore Daemon
Use the following command to display the status of the automatic path restoration
daemon, 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 Daemons
To display the number of error daemons that are running, use the following command:
# vxdmpadm stat errord
DMP in a Clustered Environment
Note You may need an additional license to use this feature.
In a clustered environment where active/passive type disk arrays are shared by multiple
hosts, all hosts in the cluster should access the disk via the same physical path. If a disk
from an active/passive type shared disk array is accessed via multiple paths
simultaneously, it could lead to severe degradation of I/O performance. This requires
path failover on a host to be a cluster coordinated activity for an active/passive type disk
array.