IBM V7000 Introduction And Implementation Manual page 290

users to clean up or archive data. This significantly enhances the value of existing storage
assets, and the benefits to the business are immediate. Capital expense of upgrading or
expanding the storage system is delayed.
Compression for replicated/mirrored data:
Remote volume copies can be compressed in addition to the volumes at the primary
storage tier. This reduces storage requirements in Metro Mirror and Global Mirror
destination volumes as well.
No changes to the existing environment required:
IBM Real-time Compression is an integral part of the storage system, and was designed
with transparency in mind so that it can be implemented without changes to applications.
Creating a compressed volume
To create a Compressed volume, complete the following steps:
1. Click New Volume and select Compressed as shown in Figure 6-19.
Figure 6-19 Compressed Volume - select a pool
Notice the warning given, that creating a first compressed volume might affect the
performance of existing non-compressed volumes in a pre-existing system. It is important
to understand the way the resources are re-allocated when the first compressed volume is
created. Hence, creating a compressed volume requires some planning in case the
system is already busy with high CPU without the compression enabled. For more detailed
information about planning and implementation, see Real-time Compression in SAN
Volume Controller and Storwize V7000, REDP-4859.
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide