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To maximize data reduction efficiency the system needs to accommodate multiple sizes of compressed data. To support a variety of compression sizes, multiple compression pools are used to create an optimal backend. Optimized data placement is the function responsible for dynamically changing the compression pools as needed. This alters the backend by creating various compression pools that cater to the incoming data. The result is an evolving layout of compression pools that dynamically change to match the reducibility of data sent to the system.
Compression pools are identified by labels which represent the track size for the data devices within the pool. For example, the 128KB pool is made up of data devices where the tracks are all 128KB in size. The 8KB pool is made up of data devices where the tracks are all 8KB in size. In comparison the capacity of the data devices between the pools is the same, however, the 8KB pool has 16 times the number of tracks. Here is a complete list of possible compression pools; 8KB, 16KB, 24KB, 32KB, 40KB, 48KB, 56KB, 64KB, 72KB, 80KB, 88KB, 96KB, 104KB, 112KB, and 128KB. Due to the dynamic design each compression-enabled system may have a different combination of compression pools that reduced data populates.