HP StorageWorks Virtual Array 7000 Family User and Service Guide (January 2005)

Product Overview 39
Product Overview
Figure 12 Virtual Data Storage
Redundancy Groups
Array physical capacity is divided into Redundancy Groups. A Redundancy
Group (RG) can be thought of as an independent array. Each RG has its own
set of disks, active hot spare, and controller. LUNs are created from capacity
within a single RG. LUNs can be accessed simultaneously through either
controller.
Multiple redundancy groups provide the following benefits:
■ Fault isolation. Because each redundancy group has its own resources, a
disk failure in one RG will not impact the other RG. This effectively
increases the data availability of the array.
■ Performance management. Applications can be assigned to different RGs,
thus isolating their performance impact on each other.
■ Greater configurability. Each RG can be constructed from different classes
of disks. As an example, one RG could be constructed from a few, small,
Host
LUN 1
LUN 2
Cache
Maps
Storage
Pool