HP StorageWorks XP LUN Configuration and Security Manager User Guide: HP XP12000 Disk Array HP XP10000 Disk Array HP 200 Storage Virtualization System (T1714-96030, June 2010)

also divide a logical volume into smaller ones for a command device, which efficiently exploits the
disk's capacity.
CVS operations include: Volume to Space, Install CV, Volume Initialize, and Make Volume. The
Volume to Space function formats one or more LDEVs on a selected Virtual Device (VDEV) into free
space. That free space can either be used to install one or more variable-sized volumes (CVs) using
the Install CV function, or left as free space for future use. The Volume Initialize function de-installs all
variable sized volumes (CVs) under a CVS volume, and reformats the CVS volume as a normal volume
(VDEV). The Make Volume function clears all variable-sized volumes (CVs) under a CVS volume and
creates an initial volume (VDEV) consisting of the new user-defined CVs.
For an overview of how the Volume Initialize function works, see Figure 77. For an overview of how
the Make Volume function works, see Figure 78.
Figure 77 Overview of Volume Initialize function
.
Figure 78 Overview of Make Volume function
.
Parity group configuration
One parity group consists of a maximum of 16 VDEVs. For RAID-5 (7D + 1P) or RAID-6 (6D + 2P)
levels, a maximum of 512 fixed-size volumes (FVs) and a certain amount of free space are available
in one VDEV. For other RAID levels, a maximum of 256 FVs and a certain amount of space are
available in one VDEV. Each VDEV in a parity group has the same configuration, and is assigned
the same FVs of the same size and RAID level.
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