Monitoring the Performance

Use the Performance Monitor to select logical drives and controllers to monitor or to change the polling interval.

Keep these guidelines in mind when using the Performance Monitor:

  1. Select Storage Subsystem >> Monitor Performance .
  2. Click Settings.
    1. Select the items that you will monitor. You can monitor these items:
      • Controllers
      • Logical Drives
      • Storage subsystem totals
    2. Select how often you want to update the performance statistics by adjusting the polling interval.


      Important:

      For an accurate elapsed time, do not use the Set Controller Clocks option while using the Performance Monitor.

    Each time the polling interval elapses, the Performance Monitor queries the storage subsystem again and updates the statistics in the table.
  3. Click Start.
    Values appear for the selected storage subsystems in the Performance Monitor data table. The table is updated at the interval specified in the Polling Interval setting. Click Update to force an immediate poll of the storage subsystem.
  4. Click Stop to stop monitoring the storage subsystem.
  5. Click Save As on the Performance Monitor main dialog to save the currently displayed performance statistics.
  6. Select an applicable directory.
  7. Type a file name in the File name text box.


    Note:

    The .perf extension is the default.

  8. Select a file type from the Files of type list.
  9. Click Save.
    The Performance Monitor data provides information about how your storage subsystem is performing. The data is presented in eight columns, which are described in this table. Use this data to make performance tuning decisions for your storage subsystem.
    Column Description
    Devices The name of the particular device whose statistics are displayed. The device can be a controller, logical drive, or the totals for the storage subsystem. The totals for the storage subsystem are the sum of the statistics of all of the controllers in the storage subsystem.
    Total I/Os The number of total I/Os performed by this storage subsystem since Start was selected. When this number exceeds 99,999, it appears in thousands (K), beginning with 100K until the number reaches 9999K, at which time it appears in millions (M). For amounts greater than 9999K but less than 100M, the value appears in tenths (for example, 12.3M).
    Read Percentage The percentage of total I/Os (previous column) that are read operations for this storage subsystem. Write percentage can be calculated as 100 minus this value.
    Cache Hit Percentage The percentage of reads that are fulfilled by data from the cache rather than requiring an actual read from disk.
    Current KB/second The current KB per second, or transfer rate. Current means the number of KB per second since the last time that the polling interval elapsed, causing an update to occur, or since Update was selected.
    Maximum KB/second The highest value achieved by the current KB per second column for this polling session, or since Start was selected.
    Current IO/second The current I/Os per second. Current means the number of I/Os per second since the last time the polling interval elapsed, causing an update to occur, or since Update was selected.
    Maximum IO/second The highest value achieved by the current I/Os per second column for this polling session, or since Start was selected.

Related Links: