hIOmon I/O Trender Synopsis Display

The hIOmon "I/O Trender Display" includes the "Synopsis" display option, which provides a brief, general summary of key performance values along with the associated time context.

The time context includes the respective "Time Scope", which is the overall time period associated with the performance values; the Time Scope can be a day, week, month, one or more quarters, or a year.

The screenshot below illustrates the display of the performance metric values retrieved from a hIOmon Manager Export File.  The content of this file reflects summarized hIOmon I/O operation performance metrics that have been coalesced upon a quarterly basis.  Consequently, the "Time Scope" is three (3) months as shown within the screenshot.  Note that the first quarter only reflects metrics for March due to the "start date / end date" values specified when the hIOmon Manager Export File was coalesced.

You can zoom-in to a particular region of the hIOmon I/O Trender Display.  Simply use the cursor to select the rectangular region of the display to be expanded.

The screenshot below shows the second quarter of the screenshot above.  The legend shown within the screenshot above has been hidden within the screenshot below.

Three percentages are provided for the displayed Time Scope (the first bar shown within the display above):

• The "Observation Period" as a percentage of the Time Scope.  The Observation Period is the overall length of time during which the hIOmon I/O Monitor was running and capturing the displayed performance metrics.

• The "Time IOPS" as a percentage of the Time Scope.  This percentage reflects the amount of time (based upon seconds within the Observation Period) during which I/O operation activity of the respective type was observed by the hIOmon I/O Monitor.  These seconds within the Observation Period reflect the accumulated count of one-second time intervals for all IOP Ranges combined.

• The "Active Time" percentage, which reflects the percentage of the Time Scope during which the I/O operations were active for the monitored item (i.e., issued I/O operations being processed, including those queued).

In addition to the Time Scope and related metrics, the following I/O operation performance values are displayed for the associated Time Scope:

• The "I/O Count", which is the total number of I/O operations of the applicable type observed by the hIOmon I/O Monitor for the monitored item during the Time Scope.

• The "Data Transfer" amount, which is the total amount of data transferred by the I/O operations of the applicable type as observed by the hIOmon I/O Monitor for the monitored item for the monitored item during the Time Scope.

• The overall hIOmon "DataTransferred/Time Index (DXTI)" value for the monitored item.  The displayed DXTI value reflects the DXTI for the Time Scope.

The following hIOmon "Performance Threshold Range Count" related performance values along with read/write and random access percentages are also optionally displayed by enabling the "Range Count" option for the Synopsis display:

• For the "IOPS Range Counts", the IOPS Range Count range with the largest accumulated count.  In addition, the "highest" IOPS Range Count range is also displayed, i.e., the highest IOPS Range Count range with a non-zero accumulated count.  Note that the percentages displayed reflect the percentage of time within the Observation Period that the respective IOPS Range Count range was observed by the hIOmon I/O Monitor.

• For the "MBS Range Counts", the MBS Range Count range with the largest accumulated count.  In addition, the "highest" MBS Range Count range is also displayed, i.e., the highest MBS Range Count range with a non-zero accumulated count.  Note that the percentages displayed reflect the percentage of time within the Observation Period that the respective MBS Range Count range was observed by the hIOmon I/O Monitor.

• For the "Queue Depth (QD) Range Counts", the QD Range Count range with the largest accumulated count.  In addition, the "highest" QD Range Count range is also displayed (i.e., the highest QD Range Count range with a non-zero accumulated count) along with the "QD > 1" Range Count.  Note that the percentages displayed reflect the percentage of I/O operations of the applicable type that experienced the respective Queue Depth range as observed by the hIOmon I/O Monitor.

• For the "Response Time (RT) Range Counts", the RT Range Count range with the largest accumulated count.  In addition, the "highest" RT Range Count range is also displayed (i.e., the highest RT Range Count range with a non-zero accumulated count) along with the "lowest" RT Range Count range.  Note that the percentages displayed reflect the percentage of I/O operations of the applicable type that experienced the respective RT range as observed by the hIOmon I/O Monitor.

• "R/W %", which includes the read I/O operation percentage (for read and read/write displays) or the write I/O operation percentage (for write displays).  In addition, the read data tranferred amount percentage (for read and read/write displays) or the write data tranferred amount percentage (for write displays) is also displayed.

• "Random %", which includes the read random access I/O operation percentage (for read and read/write displays) or the write random access I/O operation percentage (for write displays).  In addition, the read random access "data transferred" percentage (for read and read/write displays) or the write "data transferred" percentage (for write displays) is also displayed.

Hover over a specific portion (or point) of a bar to display the respective metric.  As shown above, just over 4 terabytes of data were read or written during the second quarter.

Please note that the Synopsis option can be selected separately for read, write, and/or combined read and write I/O operations.

Bringing Transparency to Disk I/O Performance℠