Veritas Storage Foundation Cross-Platform Data Sharing 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

14 Overview of CDS
CDS disk access and format
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, shared disk groups (by CVM), or distributed
disk groups (by a volume server).
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.
Device quotas
Device quotas limit the number of objects in the disk group which create
associated device nodes in the file system. Device quotas are useful for disk
groups which to be transferred between Linux with a pre-2.6 kernel and other
supported platforms such as HP-UX. Prior to the 2.6 kernel, Linux supported
only 256 minor devices per major device.
You can limit the number of devices that can be created in a given CDS disk
group by setting the device quota.
See “Setting the maximum number of devices for CDS disk groups” on page 32.
When you create a device, an error is returned if the number of devices would
exceed the device quota. You then either need to increase the quota, or remove
some objects using device numbers, before the device can be created.
See “Displaying the maximum number of devices in a CDS disk group” on
page 36.
Note: The default device quota for HP-UX is 32767.