VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)
Administering Dynamic Multipathing (DMP)
Administering DMP Using vxdmpadm
Chapter 3 125
The specified DMP node must be a valid node in the /dev/vx/rdmp
directory.
You can also use getsubpaths to obtain all paths through a particular
host disk controller:
# vxdmpadm getsubpaths ctlr=c2
Listing Information About Host I/O Controllers
The following command lists attributes of all host I/O controllers on the
system:
# vxdmpadm listctlr all
This form of the command lists controllers belonging to a specified
enclosure and enclosure type:
# vxdmpadm listctlr enclosure=enc0 type=X1
Disabling a Controller
Disabling I/O to a host disk controller prevents DMP from issuing I/O
through the specified controller. The command blocks until all pending
I/O issued through the specified disk controller are completed.
To disable a controller, use the following command:
# vxdmpadm disable ctlr=ctlr
Enabling a Controller
Enabling a controller allows a previously disabled host disk controller to
accept I/O. This operation succeeds only if the controller is accessible to
the host and I/O can be performed on it. When connecting active/passive
disk arrays in a non-clustered environment, the enable operation results
in failback of I/O to the primary path. The enable operation can also be
used to allow I/O to the controllers on a system board that was previously
detached.
To enable a controller, use the following command:
# vxdmpadm enable ctlr=ctlr