XPWatch and XPSketch Reference guide for HP XP P9000 Performance Advisor

Table 28 LDEV performance metrics (continued)
DescriptionPerformance Metrics
Back-end / Front-end I/O ratioBack-end to Front-end IO ratio [%]
Average LDEV I/O utilizationLDEV Utilization % for LDEV
Back-end I/OCache lines staged/destaged [1/s]
Average Read Response timer_ms [ms]
Average Write Response timew_ms [ms]
Maximum of (Maximum Read Response time and Maximum
Write Response time)
ms^ [ms]
Maximum Read Response timer_ms^ [ms]
Maximum Write Response timew_ms^ [ms]
Table 29 describes the RAID group performance metrics.
Table 29 RAID group performance metrics
DescriptionPerformance Metrics
Average Front-end I/OsAvgIO (TotalRd + TotalWr)
Average Write percentageWrite Ratio %
Average Sequential I/O percentageSequential IO ratio %
Average Read Cache Hit percentageRead hits % for LDEV
Average ThroughputThroughput [KB/s]
Average I/O Response TimeIO response time [ms]
Back-end / Front-end I/O ratioBack-end to Front-end IO ratio [%]
Back-end I/OCache lines staged/destaged [1/s]
Average Read Response timer_ms [ms]
Average Write Response timew_ms [ms]
Maximum of (Maximum Read Response time and Maximum
Write Response time)
ms^ [ms]
Maximum Read Response timer_ms^ [ms]
Maximum Write Response timew_ms^ [ms]
Table 30 describes the CPU performance metrics.
Table 30 CPU performance metrics
DescriptionPerformance Metrics
Minimum CPU utilization on PCB[%]Minimum Utilization[%]
Maximum CPU utilization on PCB[%]Maximum Utilization[%]
Average CPU utilization on PCB[%]Average Utilization[%]
CHA PCB Busy Time for CPU 0(if installed)Utilization for MP 0 0[1/s]
CHA PCB Busy Time for CPU 1(if installed)Utilization for MP 1 0[1/s]
CHA PCB Busy Time for CPU 2(if installed)Utilization for MP 2 0[1/s]
CHA PCB Busy Time for CPU 3(if installed)Utilization for MP 3 0[1/s]
Understanding performance metrics in HP XP P9000Sketch 61