HP StorageWorks XP10000 Disk Array - Manual (Page 139)

7 Overview of Volume Manager
and Custom Volume Size
Volume Manager and Custom Volume Size (CVS) are functions for open systems and mainframe systems.
To use these functions, you need the software called HP StorageWorks LUN Configuration and Security
Manager XP.
This chapter describes Volume Manager and CVS.
Overview of Volume Manager
This section describes the Volume Manager function and configuration of LUSE volumes (expanded LUs).
Volume Manager operations include the following:
• Viewing concatenated parity groups
• Creating LUSE volumes
• Releasing LUSE volumes
• Changing LUSE capacities
Volume Manager function
The Volume Manager function is applied to open-system logical volumes and enables you to configure
one large logical volume by combining several small LDEVs. The Volume Manager function allows hosts
that can only use a limited number of logical units (LUs) per fibre interface to access larger amounts
of data using expanded LUs.
Figure 76 shows the LUSE configuration. By using the Volume Manager function, you can combine
several logical devices (LDEVs) or volumes into one large logical volume. The configured LDEV's size
can be expanded up to 36 times the size of the original LDEV. The ID of the logical volume defined as
the large logical volume is represented by the smallest LDEV ID (assigned to the top LDEV). The host
recognizes the expanded logical volume as one representative LDEV. As long as the number of LDEVs
combined into one large logical volume does not exceed the specified limit (see Volume Manager
guidelines ), you can arbitrarily select any LDEVs as the volumes to combine, regardless of their size (or
capacity) or whether or not they are on the same Control Unit (CU). The Volume Manager function also
allows you to combine several LDEVs and a LUSE volume (combined LDEVs) into one LUSE volume, or
combine LUSE volumes together into one LUSE volume.
Before the host can access each LDEV composing an expanded LU (LUSE volume), you must release
the expanded LU.
HP StorageWorks LUN Configuration and Security Manager XP user guide for the
XP12000/XP10000/SVS200
139