HP StorageWorks P9000 Performance Advisor Software v5.3 User and Troubleshooting Guide (T1789-96322, August 2011)

DescriptionMetricMetric category
The average write
response time value for an
LDEV is obtained from
dividing the accumulated
response time of all the
I/Os by the total number
of I/Os on that LDEV.
Average write
response time =
Accumulated
response time of
all I/Os / total
number of I/Os
The average write re-
sponse time of all the
LDEVs created in a spe-
cified RAID group over
the entire data collection
interval.
Average Write Response
The maximum write re-
sponse time of all the
LDEVs created in a spe-
cified RAID group in the
last 30 seconds of the
collection interval.
Maximum Write Re-
sponse
Real-time metrics and descriptions
“Real-time metrics and descriptions” on page 460 provides the real-time metrics and their descriptions.
Table 35 Real-time metrics definitions
DefinitionsReal-time metrics
Average Front End writes/Average Front EndTotal IOAvg write ratio
Average FE Sequential IO/ Avareage FE total IOAvg seq IO ratio
Average Read I/Os found in the CacheAvg Read hits
Average read/write I/O response timeAvg IO response Time
Average Read response timeAvg Read response time
Average write response timeAvg write response
Maximum FE read/write response timeMax IO response time
Maximum FE read response timeMax read response time
Maximum FE write response timeMax write response time
Total FE (Sum of reads and write) I/OsTotal IO per second
Total FE (Sum of reads and write) I/OsTotal throughput kb per second
Total backend transfers vs Front end IO ratioTotal backend to frontend IO
Total backend read percentageTotal cache lines staged percentage
Total backend writesTotal cache lines destaged
Metric Category, metrics, and descriptions460