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

Chapter 3, Administering Dynamic Multipathing (DMP)

Administering DMP Using vxdmpadm

101

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 can be speciﬁed as 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 All Paths Controlled by a DMP Node

The following command displays the paths controlled by the speciﬁed DMP node:

# vxdmpadm getsubpaths dmpnodename=c2t1d0s2

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