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

Chapter 3, Administering Dynamic Multipathing (DMP)

Disabling and Enabling Multipathing for Specific Devices

all - Exclude all disks

aaa:123 - Exclude all disks having VID ‘aaa’ and PID ‘123’

aaa*:123 - Exclude all disks having VID starting with ‘aaa’

and PID ‘123’

aaa:123* - Exclude all disks having VID ‘aaa’ and PID starting

with ‘123’

aaa:* - Exclude all disks having VID ‘aaa’ and any PID

Enter a VID:PID combination:[<Pattern>,all,list-exclude,q,?]

❖ Select option 4 to deﬁne a pathgroup for disks that are not multipathed by VxVM. (A

pathgroup explicitly deﬁnes alternate paths to the same disk.) Only one path is made

visible to VxVM.

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.