When the compression service runs, it checks each object that’s eligible for compression. If the object isn’t already compressed, it compresses it. If compressing the object doesn’t reduce its size (for example, because it’s already in a compressed format), the compression service marks it as uncompressible and doesn’t try to compress it again in future runs.
You control which objects are eligible for compression by setting criteria in the System Management Console. For information on this, see Changing compression settings.
![]() |
Note: By default, the compression service runs only on primary storage. However, you can configure HCP to run the compression service on extended storage as well. For information on this, see Encryption and compression of objects in storage pools. |
If an object that was not eligible for compression becomes eligible, the compression service compresses it on its next run. Similarly, if a compressed object loses its eligibility for compression, the compression service decompresses it on its next run.
© 2016 Hitachi Data Systems Corporation. All rights reserved.