Total I/O Rate Report - HPE XP7 User Manual

IMPORTANT:
• The Findings section for an XP disk array provides a brief summary on the status of the CHIPs,
cache, ACP, and the LDEVs.
• The Findings section for an P9500/XP7 disk array provides a brief summary on the status of the
cache, LDEVs, and the MP blades.
• The utilization summary of the CHIP/CHA and the ACP/DKA MPs are not displayed in the Array
Performance report - Findings section for the P9500/XP7 disk arrays.
NOTE: The backend transfer is the block of data that is transferred between the XP/XP7 disk array
cache and the RAID groups. Every read cache miss results in a backend transfer.
A sample of each report is given below:

Total I/O Rate report

The Total I/O Rate report displays in a chart format, the number of total read and write I/O operations over
the entire period. Figure 12: Total I/O Rate on page 305 displays a sample Total I/O Rate report for the
P9500 Disk Array.
Figure 12: Total I/O Rate
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, a blank chart is displayed. If all
the data values are zero for the dates selected, a chart with a horizontal line along X axis is
displayed in the center of the chart.
Total I/O Rate report 305