SVS200 (T1714-96008, June 2006)

132 Overview of Volume Manager and Custom Volume Size

As the result of CVS operations, a VDEV contains FVs, CVs, and free spaces that are delimited in logical

cylinders. Sequential free spaces are combined into a single free space (see Figure 82).

Figure 82 Virtual CVS volume configuration

Volume to Space function

This function converts one or more LDEVs (FVs or CVs) into free space, which deletes the selected LDEVs

from that VDEV.

The following are the restrictions on LDEVs and LUSE volumes for the Volume to Space operation:

• The LDEV must not be path-defined (including TrueCopy for z/OS, Continuous Access XP,

ShadowImage for z/OS, Business Copy XP, and Continuous Access XP Journal pair volumes).

• The LDEV must not be a component of a LUSE volume.

• The LDEV must not be reserved for Auto LUN XP.

• The LDEV must be read/write-enabled.

• The LDEV or LUSE volume must not be a pool volume (pool-VOL).

• The LDEV must not be a journal volume.

• The LDEV must not be a remote command device.

• The LDEV must not contain extents.

Install CV function

This function defines and installs one or more CVS volumes under an existing volume (free space in a

VDEV). You can assign a specific number of physical cylinders (for mainframe systems) or MBs (for open

systems) to each CVS volume for maximum control over the volume size. When you specify the capacity

and an emulation type other than OPEN-V for a CVS volume to be created, the Install CV function

automatically creates and formats the CVS volume in sufficient free space. You must specify new CU and

LDEV numbers for the created CVS volume. The created CVS volume contains the user-specified number of

user cylinders and a predetermined number of control cylinders according to the emulation type.

NOTE: If you select free space and perform an Install CV operation, CVS volumes are created only in the

selected free space.