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

Disk Devices

54 VERITAS Volume Manager Administrator’s Guide

The device name (sometimes referred to as devname or disk access name) deﬁnes where the

disk is located in a system.

Note The fullpathname ofa device is/dev/vx/[r]dsk/devicename. In thisdocument,

only the device name is listed and /dev/vx/[r]dsk is assumed.

Disk Device Naming in VxVM

Prior to VxVM 3.2, all disks were named according to the c#t#d# format. Fabric mode

disks were not supported by VxVM. From VxVM 3.2 onward, there are two different

methods of naming disk devices:

◆ c#t#d# Based Naming Scheme

◆ Enclosure Based Naming Scheme

c#t#d# Based Naming Scheme

In this naming scheme, all disk devices except fabric mode disks are named using the

c#t#d# format.

The syntax of a device name is c#t#d#, where c# represents a controller on a host bus

adapter, t# is the target controller ID, and d# identiﬁes a disk on the target controller.

Fabric mode disk devices are named as follows:

◆ Disk in supported disk arrays are named using the enclosure name_# format. For

example, disks in the supported disk array name FirstFloor are named

FirstFloor_0, FirstFloor_1, FirstFloor_2 and so on. (You can use the

vxdmpadm command to administer enclosure names.)

◆ Disks in the DISKS category (formerly know as JBOD disks) are named using the

Disk_# format.

◆ Disks in the OTHER_DISKS category are named using the fabric_# format

Enclosure Based Naming Scheme

The enclosure-based naming scheme operates as follows:

◆ All fabric or non-fabric disks in supported disk arrays are named using the

enclosure_name_# format. For example, disks in the supported disk array,

enggdept arenamed enggdept_0,enggdept_1, enggdept_2 and so on. (You can

use the vxdmpadm command to administer enclosure names. See “Administering

DMP Using vxdmpadm” on page 100 and the vxdmpadm(1M) manual page for more

information.)