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PowerScale OneFS 9.3.0.0 CLI Administration Guide

Inline deduplication interoperability

Inline deduplication interoperates with OneFS as follows.

SmartDedupe
Use to find deduplication matches not found by inline deduplication.
Data compression
Inline deduplication operates on uncompressed data. Data written to shadow stores is compressed.
Snapshots
Writes to snapshots are not inline deduplicated, but deduplicated data can be copied on write to snapshots.
Packing (Small File Storage Efficiency)
Packed files are skipped by inline deduplication, though zero block elimination still occurs.
Backup and restore
Backup and inline deduplication interoperate in the same way that backup and SmartDedupe interoperate. Files that were deduplicated using inline deduplication are indistinguishable from files that were deduplicated using SmartDedupe, and the same conditions apply. The local file remains deduplicated on disk. Files are rehydrated on read and the full file contents are backed up. As with SmartDedupe, ensure that the target clusters or backup devices have enough space to accommodate un-deduplicated files. However, transferring data to another PowerScale cluster that has inline deduplication enabled can help you to avoid requiring the full rehydrated capacity on the target cluster.

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