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What does Max/Min/Ave Column in perfstat mean?

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Applies to

  • SANtricity OS
  • SMcli savestorageArrayperformanceStats command

Answer

Below are the calculation methods for each metric as output by savestorageArrayperformanceStats:

  • Total IOs:
    The cumulative total number of I/O operations since the command began. For a MonitorInterval of 10 seconds, this is the sum over all intervals.

  • Maximum/Minimum/Average fields (e.g., MaximumMBs/sec, MinimumIOs/sec, AverageIOLatency):

    • Maximum: The highest value observed for the metric across all intervals.
    • Minimum: The lowest value observed for the metric across all intervals.
    • Average: The arithmetic mean of the metric’s value across all intervals (e.g., for 5 iterations, the mean of 5 values).

  • Current fields (e.g., CurrentMBs/sec, CurrentIOs/sec, CurrentIOLatency):
    The value observed during the most recent interval (i.e., the average value for the last MonitorInterval).

  • Read%, PrimaryReadCacheHit%, PrimaryWriteCacheHit%, SSDCacheHit%:
    The percentage values are calculated as the average across all intervals.

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