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PowerScale OneFS 9.2.1.0 CLI Administration Guide

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View estimated storage savings before defragmenting

Run the defragmenter in assessment mode to generate statistics about the amount of disk space that could be reclaimed by the defragmentation process.

Assessment mode does not move any data or make any other on-disk changes. It is a quick operation, useful to help determine if the defragmenter should be run. It requires existing ShadowStores with previously containerized data.

To run the assessment and view results, use the isi_sstore defrag command with appropriate options on the command line .

NOTE Although you may set up the global configuration so that the ShadowStoreDelete job runs the defragmenter in assessment mode, the job output does not display the statistics.
  1. Log onto any node in the cluster.
    You do not need to be root but you need PRIV_ROOT privilege. Using sudo is typically enough.
  2. Run the isi_sstore defrag command using at least the -d and -a options.
    The -d option enables the defragmenter for this command run. The defragmenter does not need to be globally enabled.
    The -a option runs the defragmenter in assessment mode.
    For descriptions of all available options, see isi_sstore defrag.
    As an example, the following command displays potential storage savings if the small files storage efficiency containers are defragmented and protection groups are reduced. 
    # isi_sstore defrag -d -a -c -p -v
The example above displays statistics similar to the following: 
# isi_sstore defrag -d -a -c -p -v
…
Processed 1 of 1 (100.00%) shadow stores, space reclaimed 31M
Summary:
Shadows stores total: 1
Shadows stores processed: 1
Shadows stores skipped: 0
Shadows stores with error: 0
Chunks needing defrag: 4
Estimated space savings: 31M

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