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

Administering Dynamic Multipathing (DMP)

Disabling and Enabling Multipathing for Speciﬁc Devices

Chapter 3114

You can specify a pathname or a pattern at the prompt. Here are some path

selection examples:

all: all paths

c3t4d2: a single path

list: list all paths on the system

Enter a pathname or pattern :[<pattern>,all,list,list-exclude,q,?]

If a path is speciﬁed, the corresponding disk are claimed in the

OTHER_DISKS category and hence not multipathed.

• Select option 7 to disable multipathing for disks that match a

speciﬁed Vendor ID and Product ID.

NOTE This option requires a reboot of the system.

Exclude VID:PID from DMP

Menu: VolumeManager/Disk/ExcludeDevices/VIDPID-DMP

Use this operation to prevent vxdmp from multipathing disks returning a specific

VID:PID combination.

As a result of this operation, all disks that return VendorID:ProductID matching

the specified combination will be claimed in the OTHER DISKS category(i.e. they

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

vxdiskadm command.

You can specify a VendorID:ProductID combination at the prompt. The specification

can be as follows:

VID:PID where VID stands for Vendor ID

PID stands for Product ID

(The command vxdmpinq in /etc/vx/diag.d can be used to obtain the Vendor ID and

Product ID)

Both VID and PID can have an optional ’*’ (asterisk) following them.

If a ’*’ follows VID, it will result in the exclusion of all disks returning

Vendor ID starting with the specified VID. The same is true for Product ID as

well. Both VID and PID should be non NULL. The maximum allowed lengths for Vendor

ID and Product ID are 8 and 16 characters respectively.