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Guidelines for using data compression on existing data

You can achieve maximum space savings on FlexVol volumes by running data compression before creating Snapshot copies. After data compression is enabled, by default only the new data that is written to the disk is compressed. However, you can compress the data that existed on the disk prior to enabling compression.

When existing data is compressed, by default the data containing shared blocks and data that is locked in a Snapshot copy is bypassed.

You should be aware of the following guidelines when using the data compression operation: