Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Disk Devices
62 VERITAS Volume Manager Administrator’s Guide
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 which is used for the
allocation of storage space to subdisks.
A disk’s type identifies how VxVM accesses a disk, and how it manages the disk’s private
and public regions. The following disk access types are used by VxVM:
simple The public and private regions are on the same disk area (with the public
area following the private area).
nopriv There is no private region (only a public region for allocating subdisks).
This is the simplest disk type consisting only of space for allocating
subdisks. Such disks are most useful for defining special devices (such as
RAM disks, if supported) on which private region data would not persist
between reboots. They can also be used to encapsulate disks where there
is insufficient room for a private region. The disks cannot store
configuration and log copies, and they do not support the use of the
vxdisk addregion command to define reserved regions. VxVM cannot
track the movement of nopriv disks on a SCSI chain or between
controllers.
auto When the vxconfigd daemon is started, VxVM obtains a list of known
disk device addresses from the operating system and configures disk
access records for them automatically.
Auto-configured disks (with disk access type auto) support the following disk formats:
cdsdisk The disk is formatted as a Cross-platform Data Sharing (CDS) disk that is
suitable for moving between different operating systems. This is the
default format for disks that are not used to boot the system.Typically,
most disks on a system are configured as this disk type. However, it is not
a suitable format for boot, root or swap disks, for mirrors or
hot-relocation spares of such disks, or for EFI disks.
hpdisk The disk is formatted as a simple disk. This format can be applied to disks
that are used to boot the system. The disk can be converted to a CDS disk
if it was not initialized for use as a boot disk.
See the vxcdsconvert(1M) manual page for information about the utility that you can
use to convert disks to the cdsdisk format.
By default, auto-configured disks are formatted as cdsdisk disks when they are
initialized for use with VxVM. You can change the default format by using the
vxdiskadm(1M) command to update the /etc/default/vxdisk defaults file as