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

Chapter 2 68

— 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 76 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 126.

Private and Public Disk Regions

A VM disk usually has two regions:

• private region—a small area where conﬁguration information is

stored. A disk header label, conﬁguration records for VxVM objects

(such as volumes, plexes and subdisks), and an intent log for the

conﬁguration database are stored here. The default private region

size is 1024 blocks (1024 kilobytes), which is large enough to record

the details of about 2000 VxVM objects in a disk group.

Under most circumstances, the default private region size should be

sufﬁcient. For administrative purposes, it is usually much simpler to

create more disk groups that contain fewer volumes, or to split large

disk groups into several smaller ones (as described in “Splitting Disk

Groups” on page 163). If required, the value for the private region

size may be overridden at installation time by choosing the Custom

Installation path, or when you add or replace a disk using the

vxdiskadm command.

NOTE Each disk that has a private region holds an entire copy of the

conﬁguration database for the disk group. The size of the

conﬁguration database for a disk group is limited by the size of the

smallest copy of the conﬁguration database on any of its member

disks.

• public region—an area that covers the remainder of the disk and is

used to store subdisks (and allocate storage space).

The following basic disk types are used by VxVM: