VERITAS Volume Manager 4.1 Administrator's Guide

Administering Dynamic Multipathing (DMP)

Administering DMP Using vxdmpadm

Chapter 3146

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

Renaming an Enclosure

The vxdmpadm setattr command can be used to assign a meaningful name to an existing

enclosure, for example:

# vxdmpadm setattr enclosure enc0 name=GRP1

This example changes the name of an enclosure from enc0 to GRP1.

NOTE The maximum length of the enclosure name preﬁx is 25 characters. The name

must not contain an underbar character (_).

The following command shows the changed name.

# vxdmpadm listenclosure all

ENCLR_NAME ENCLR_TYPE ENCLR_SNO STATUS

============================================================

others0 OTHER OTHER_DISKS CONNECTED

seagate0 SEAGATE SEAGATE_DISKS CONNECTED

GRP1 T300 60020f20000001a90000 CONNECTED