Veritas Storage Foundation Portable Data Containers: Cross-Platform Data Sharing 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

Note: With other (non-CDS) VxVM disk formats, the private and public regions
are aligned to the platform-specific OS block size.
Disk access type auto
The disk access (DA) disk type auto supports multiple disk formats, including
cdsdisk, which is supported across all platforms. It is associated with the DA
records created by the VxVM auto-configuration mode. Disk type auto
automatically determines which format is on the disk.
Platform block
The platform block resides on disk sector 0, and contains data specific to the
operating system for the platforms. It is necessary for proper interaction with
each of those platforms. The platform block allows a disk to perform as if it was
initialized by each of the specific platforms.
AIX coexistence label
The AIX coexistence label resides on the disk, and identifies the disk to the AIX
logical volume manager (LVM) as being controlled by VxVM.
HP-UX coexistence label
The HP-UX coexistence label resides on the disk, and identifies the disk to the HP
logical volume manager (LVM) as being controlled by VxVM.
VxVM ID block
The VxVM ID block resides on the disk, and indicates the disk is under VxVM
control. It provides dynamic VxVM private region location and other information.
CDS disk groups
A CDS disk group allows cross-platform data sharing of VxVM objects, so that
data written on one of the supported platforms may be accessed on any other
supported platform. A CDS disk group is composed only of CDS disks (VM disks
with the disk format cdsdisk), and is only available for disk group version 110
and greater.
Note: The CDS conversion utility, vxcdsconvert, is provided to convert non-CDS
VM disk formats to CDS disks, and disk groups with a version number less than
110 to disk groups that support CDS disks.
15Overview of CDS
CDS disk access and format