Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

By default, VxVM uses enclosure-based naming.

You can change the disk-naming scheme if required.

See “Changing the disk-naming scheme” on page 99.

Operating system-based naming

Under operating system-based naming, all disk devices except fabric mode disks

are displayed either using the legacy c#t#d# format or the persistent disk##

format. By default, VxVM commands display the names of these devices in the

legacy format as these correspond to the names of the metanodes that are created

by DMP.

The syntax of a legacy 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.

DMP assigns the name of the DMP meta-device (disk access name) from the

multiple paths to the disk. DMP sorts the names by controller, and selects the

smallest controller number. For example, c1 rather than c2. If multiple paths are

seen from the same controller, then DMP uses the path with the smallest target

name. This behavior make it easier to correlate devices with the underlying storage.

If a CVM cluster is symmetric, each node in the cluster accesses the same set of

disks. This naming scheme makes the naming consistent across nodes in a

symmetric cluster.

By default, OS-based names are not persistent, and are regenerated if the system

configuration changes the device name as recognized by the operating system. If

you do not want the OS-based names to change after reboot, set the persistence

attribute for the naming scheme.

See “Changing the disk-naming scheme” on page 99.

Enclosure-based naming

By default, VxVM uses enclosure-based naming.

Enclosure-based naming 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 are named enggdept_0, enggdept_1, enggdept_2 and so on.

You can use the vxdmpadm command to administer enclosure names.

See “Renaming an enclosure” on page 189.

See the vxdmpadm(1M) manual page.

■ Disks in the DISKS category (JBOD disks) are named using the Disk_# format.

Administering disks

Disk devices