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How data compression works

Data compression enables you to store more data in less space. Further, you can use data compression to reduce the time and bandwidth required to replicate data during volume SnapMirror transfers. Data compression can save space on regular files or LUNs.

However, storage system internal files, Windows NT streams, and volume metadata are not compressed.

Data compression works by compressing a small group of consecutive blocks known as a compression group. Data compression can be done in the following ways:

If both inline and postprocess compression are enabled, then postprocess compression compresses only the blocks on which inline compression was not run. This includes blocks that were bypassed by inline compression such as small, partial compression group overwrites.

Note: You cannot enable data compression on the storage system root volumes or on the volumes that are contained within 32-bit aggregates.