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PowerScale OneFS Web Administration Guide

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Writable snapshots

Writable snapshots enable you to create space-efficient, modifiable copies of a source snapshot. The source snapshot remains read-only. You can use writable snapshots for tasks such as testing data recovery scenarios and quality assurance. You create and manage writable snapshots using the OneFS CLI or API.

Using writable snapshots, you can create and manage a modifiable copy of an entire dataset from a source snapshot. The source snapshot and its writable copy must reside in a directory in the /ifs file system.

You can access writable snapshots with regular file system commands such as ls and find. The writable snapshots feature creates a directory quota on the root of the writable snapshot that you can use to monitor its space usage.

NOTE Writable snapshots preserve only the hard links within the domain of the source snapshot.

Writable snapshots populate snapshot metadata on first access. Accessing large directories for the first time with operations such as discovery (find), unlinking, and renaming can have slow response times. OneFS reads unmodified snapshot data from the source snapshot, which can also affect response times.

NOTE
The following restrictions apply to writable snapshots:
  • Writable snapshots cannot be cloud-based.
  • You cannot use compression, deduplication, inline data compression, file clones, or use small file packing with writable snapshots.
  • You cannot make a snapshot of a writable snapshot.
  • Writable snapshots do not support Write Once - Read Many (WORM).
  • Do not use SyncIQ snapshots or snapshots named SIQ-* as source snapshots.
  • You cannot create writable snapshots in a BAM domain.
  • You cannot create hard links to files within the domain of the writable snapshot from outside the writable snapshot domain.
  • You cannot rename files that reside in the writable snapshot domain from outside that writable snapshot domain.

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