SVS200 LUN Manager and Volume Manager (T1714-96015, October 2007)

7OverviewofVolumeManager

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 conc

atenated parity groups

•CreatingLUSEvolumes

•ReleasingLUSEvolumes

• Changing LU

SE 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

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