VERITAS Volume Manager 4.1 Administrator's Guide

Administering Dynamic Multipathing (DMP)
Administering DMP Using vxdmpadm
Chapter 3132
Administering DMP Using vxdmpadm
The vxdmpadm utility is a command line administrative interface to the DMP feature of
VxVM.
You can use the vxdmpadm utility to perform the following tasks.
• Retrieve the name of the DMP device corresponding to a particular path
• List all paths under a DMP device
• List all controllers connected to disks attached to the host
• List all the paths connected to a particular controller
• Enable or disable a host controller on the system
• Rename an enclosure
• Control the operation of the DMP restore daemon
The following sections cover these tasks in detail along with sample output. For more
information, see the vxdmpadm(1M) manual page.
Retrieving Information About a DMP Node
The following command displays the DMP node that controls a particular physical path:
# vxdmpadm getdmpnode nodename=c3t2d1
The physical path is specified by argument to the nodename attribute, which must be a valid
path listed in the /dev/rdsk directory.
Use the enclosure attribute with getdmpnode to obtain a list of all DMP nodes for the
specified enclosure.
# vxdmpadm getdmpnode enclosure=enc0
Displaying the Members of a LUN Group
The following command displays the DMP nodes that are in the same LUN group as a
specified DMP node:
# vxdmpadm getlungroup dmpnodename=c11t0d10
The above command displays output such as the following: