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PowerScale OneFS 9.3.0.0 CLI Administration Guide

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Monitor storage efficiency with FSAnalyze

To monitor storage efficiency, run an FSAnalyze job and then the isi_packing --fsa command.

An active File System Analytics (FSA) license is required.

This is a two-step procedure. First, the FSAnalyze job scans the file system and records the total of logical and physical blocks used. A CLI command uses that data to calculate a global storage efficiency. The storage efficiency should improve when packing is enabled.

We recommend using this procedure before and after you enable packing, to observe the storage efficiency improvements. Thereafter, use this procedure periodically to monitor the current global state of the file system's storage efficiency.

If storage efficiency degrades, you might want to use FilePool policies that match more data. You can also use the isi_sfse_assess command to help identify additional directory trees that could benefit from packing.

  1. Run the FSAnalyze job or obtain the jobid of a previously run FSAnalyze job.
    You can run the FSAnalyze job manually or on a schedule, or both. To run it manually, enter the following: 
    # isi job start FSAnalyze
  2. Generate the storage efficiency report using the following command: 
    # isi_packing --fsa [--fsa-jobid $jobid]
    Where:
    --fsa-jobid $jobid
    Specifies an FSAnalyze job run to use for generating the report. If this option is not included, isi_packing --fsa defaults to using the most recently run FSAnalyze job.
    For example: 
    # isi_packing --fsa --fsa-jobid 100
The isi_packing --fsa command produces the FSA storage efficiency report. The report is similar to the following. 
# isi_packing --fsa
FSAnalyze job: 83 (Wed Jul 27 01:57:41 2016) 
Logical size:  1.8357T 
Physical size: 3.7843T
Efficiency:    48.51%

Where:

FSAnalyze job
Shows the FSA job ID. In the example, this is 83.
Logical size
Shows the logical size of all files scanned during the FSA job run.
Physical size
Shows the physical size of all files scanned during the FSA job run.
Efficiency
Shows the file storage efficiency, calculated as logical size / physical size.
The isi_packing --fsa command does not count the files in the /ifs/.ifsvar directory as logical data. Because of that, if you run the FSA job on an empty cluster, the space used by /ifs/.ifsvar can cause FSA to report a low storage efficiency. As you store more data, the effect of /ifs/.ifsvar dissipates.

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