VERITAS Volume Manager 4.1 Administrator's Guide

Administering Dynamic Multipathing (DMP)

Disabling and Enabling Multipathing for Speciﬁc Devices

Chapter 3122

fied paths will not be multipathed by DMP. This operation can be re

versed using the vxdiskadm command.

VxVM INFO V-5-2-1266 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 returni

ng a specific VID:PID combination.

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

ctID matching the specified combination will be claimed in the OTHE

R DISKS category(i.e. they will not be multipathed by vxdmp). This

operation can be reversed using the vxdiskadm command.

VxVM INFO V-5-2-1408 You can specify a VendorID:ProductID combinati

on 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 V

endor 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 tr

ue 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