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PowerScale OneFS 9.3.0.0 CLI Administration Guide

Data compression terminology

The following list contains definitions for OneFS terminology related to data compression.

Logical data
Also known as effective data, this is a data size that excludes protection overhead and data efficiency savings from compression and deduplication.
Dedupe saved
The amount of capacity savings related to deduplication.
Compression saved
The amount of capacity savings related to in-line compression.
Preprotected physical
Also known as usable data, this is a data size that excludes protection overhead, but includes data efficiency savings from compression and deduplication.
Protection overhead
The size of the erasure coding used to protect data.
Protected physical
Also known as raw data, this is a data size that includes protection overhead, and takes into account the data efficiency savings from compression and deduplication.
Dedupe ratio
The estimated ratio of deduplication, where the ratio will be displayed as 1.0:1 if there is no deduplication on the cluster.
Compression ratio
The ratio of logical data to preprotected physical data, it's the usable efficiency ratio from compression. The ratio is calculated by dividing logical data by preprotected physical data and is expressed as x:1.
Data reduction ratio
The usable efficiency ration from compression and deduplication. This ratio will be the same as the compression ratio if there is no deduplication occurring on the cluster.
Efficiency ratio
The ratio of logical data to protected physical data. This is the overall raw efficiency ratio which is calculated by dividing logical data by protected physical data and is expressed as x:1.

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