HP XP Performance Advisor Software - Manual (Page 362)

Figure 38 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” (page 363) displays
a sample Total I/O Rate Detail report for a P9500 Disk Array.
362 Sample reports