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Compression and deduplication can significantly increase the storage efficiency of data. However, the actual space savings will vary depending on the specific attributes of the data itself.
The table below illustrates the relationship between the effective to usable and effective to raw ratios for the F910, F900, F810, F600, F200, H700, H7000, H5600, A300, and A3000 platforms:
The following table provides descriptions for the various OneFS reporting metrics, such as those returned by the ‘isi statistics data-reduction’ command described below. The table attempts, where appropriate, to equate the OneFS nomenclature with more general industry terminology:
The color scheme in this table is used throughout this paper to categorize and distinguish between the various data metrics.
The interrelation of the data capacity metrics described above can be illustrated in a graphical representation.
As we can see, the preprotected physical (usable) value, is derived by subtracting the protection overhead from the protected physical (raw) metric. Similarly, the difference in size between preprotected physical (usable) and logical data (effective) is the efficiency savings. If OneFS SmartDedupe is also licensed and running on the cluster, this data reduction savings value will reflect a combination of compression, inline deduplication, and post-process deduplication savings.