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PowerScale OneFS 9.3.0.0 CLI Administration Guide

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File system structure

Small Files Storage Efficiency uses a specific class of container ShadowStore to contain packed data. File attributes indicate the pack state and pack policy type.

You can determine the types of data that reside in a ShadowStore (SIN) by checking the SIN prefix.

  • Base shadow stores (BSINs) with the prefix 0x40 contain clone or deduplicated data.
  • Container shadow stores (CSINs) with the prefix 0x41 contain packed data.

The following file attributes indicate a file's pack state.

File attribute Description Original default before any packing or unpacking
packing_policy Indicates whether the file meets the criteria set by your file pool policies and is eligible for packing. The value is updated by the SmartPools job. Values are:
  • container—The file is eligible to be packed.
  • native—The file is not eligible to be packed.
native
packing_target Describes the file's current state. Values are:
  • container—The file is packed.
  • native—The file is explicitly unpacked, or never packed.
native
packing_complete Indicates whether the target is satisfied. Values are:
  • complete—The target is satisfied, meaning that packing or unpacking is complete.
  • incomplete—The packing state of the file is not specifically known.
complete, indicating that the packing target state is intact.
NOTE: To ensure that there is sufficient space to handle unpacking or expanding packed or deduplicated files, monitor physical space on a regular basis. In particular, SyncIQ operations unpack and expand deduplicated files on the target cluster. Those files are then repacked on the target cluster.

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