HP StorageWorks P9000 Performance Advisor Software v5.4 User Guide (T1789-96328, April 2012)

Figure 39 Total I/O Rate by hour of day
.
The total backend transfers may be compared to the total frontend I/Os and the difference is due to
the effects of the array cache. The total backend transfers load is taken by the RAID groups and
ACP/DKA pairs, where as the total frontend I/O load is taken by the CHIP/CHA ports.
NOTE:
If there are no data points available for the dates selected, blank chart is displayed. If all the data
values are zero for the dates selected, a chart with a horizontal line along the X axis is displayed in
the center of the chart.
IMPORTANT:
For the Hour of the Day report, all the points collected aggregate to the start of the hour. For example,
if data is collected between 1 p.m. and 2 p.m., the aggregate data is displayed at 1 p.m. instead of
2 p.m.
Total I/O Rate Detail report
The Total I/O Rate Detail report displays in a chart format, the number of Sequential I/Os, Random
I/Os, and CFW I/O operations, over the entire period. “Total I/O Rate Detail” on page 405 displays
a sample Total I/O Rate Detail report for a P9500 Disk Array.
Sample reports404