VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Administering Dynamic Multipathing (DMP)

Disabling and Enabling Multipathing for Speciﬁc Devices

Chapter 3 113

Exclude all but one paths to a disk

Menu: VolumeManager/Disk/ExcludeDevices/PATHGROUP-VXVM

Use this operation to exclude all but one paths to a disk. In case of disks which

are not multipathed by vxdmp, VxVM will see each path as a disk. In such cases,

creating a pathgroup of all paths to the disk will ensure that only one of the

paths from the group is made visible to VxVM. The pathgroup can be removed using

the vxdiskadm command.

Example: If c1t30d0 and c2t30d0 are paths to the same disk and both are seen by

VxVM as separate disks, c1t30d0 and c2t30d0 can be put in a pathgroup so that

only one of these paths is visible to VxVM.

The pathgroup can be specified as a list of blank separated paths, for example,

c1t30d0 c2t30d0.

Enter pathgroup: [<pattern>,list,list-exclude,q,?]

• Select option 5 to disable multipathing for all disks on a speciﬁed

controller.

Exclude controllers from DMP

Menu: VolumeManager/Disk/ExcludeDevices/CTLR-DMP

Use this operation to exclude all disks on a controller from being multipathed by

vxdmp.

As a result of this operation, all disks having a path through the specified

controller will be claimed in the OTHER_DISKS category and hence, not multipathed

by vxdmp. This operation can be reversed using the vxdiskadm command.

You can specify a controller name at the prompt. A controller name is of the form

c#, example c3, c11 etc. Enter ’all’ to exclude all paths on all the controllers

on the host. To see the list of controllers on the system, type ’list’.

Enter a controller name:[<ctlr-name>,all,list,list-exclude,q,?]

• Select option 6 to disable multipathing for speciﬁed paths.

Exclude paths from DMP

Menu: VolumeManager/Disk/ExcludeDevices/PATH-DMP

Use this operation to exclude one or more disks from DMP.

As a result of this operation, the disks corresponding to the specified paths

will not be multipathed by DMP. This operation can be reversed using the

vxdiskadm command.