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CDS disk groups
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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.

All VxVM objects in a CDS disk group are aligned and sized so that any system can access the object using its own representation of an I/O block. The CDS disk group uses a platform-independent alignment value to support system block sizes of up to 8K.

CDS disk groups can be used in the following ways:

Initialized on one system and then used "as-is" by VxVM on a system employing a different type of platform.
Imported (in a serial fashion) by Linux, Solaris, AIX, and HP-UX systems.
Imported as private disk groups, or shared disk groups (by CVM).

You cannot include the following disks or volumes in a CDS disk group:

Volumes of usage type root and swap. You cannot use CDS to share boot devices.
Encapsulated disks.

Note:

On Solaris and Linux systems, the process of disk encapsulation places the slices or partitions on a disk (which may contain data or file systems) under VxVM control. On AIX and HP-UX systems, LVM volumes may similarly be converted to VxVM volumes.

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