VERITAS Volume Manager 4.1 Administrator's Guide

Administering Disks

Disk Devices

Chapter 2 65

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:

• Devices with very long device names (for example, Fibre Channel devices that include

worldwide name (WWN) identiﬁers) are always represented by enclosure-based names.

• 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 are

named 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 132 and the vxdmpadm(1M) manual page for more information.)

• Disks in the DISKS category (formerly known as JBOD disks) are named using the

Disk_# format.

• Disks in the OTHER_DISKS category are named as follows:

— Non-fabric disks are named using the c#t#d# format.

— Fabric disks are named using the fabric_# format.

See “Changing the Disk-Naming Scheme” on page 78 for details of how to switch between the

two naming schemes.

To display the native OS device names of a VM disk (such as disk01), use the following

command:

# vxdisk list diskname

For information on how to rename an enclosure, see “Renaming an Enclosure” on page 146.

For a description of disk categories, see “Disk Categories” on page 69.