VERITAS Volume Manager 4.1 Administrator's Guide

Administering Dynamic Multipathing (DMP)
Disabling and Enabling Multipathing for Specific Devices
Chapter 3 121
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 pat
h as a disk. In such cases, creating a pathgroup of all paths to th
e disk will ensure that only one of the paths from the group is mad
e 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 an
d hence, not multipathed by vxdmp. This operation can be reversed u
sing the vxdiskadm command.
VxVM INFO V-5-2-1263 You can specify a controller name at the promp
t. 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 s
ee 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 speci