HP XP P9000Watch and HP XP P9000Sketch Reference Guide for HP XP P9000 Performance Advisor v5.5 (T1789-96341, February 2013)

D Comparing LDEV response time metrics in HP XP P9000
Performance Advisor and HP XP P9000Watch
Maximum values of LDEV response time in HP XP P9000 Performance
Advisor and HP XP P9000Watch
The maximum values of LDEV response time in P9000 Performance Advisor cannot be compared
with the response time values in HP XP P9000Watch because HP XP P9000 Performance Advisor
displays the I/O response time as separate metrics for read and write, respectively.
HP XP P9000 Performance Advisor also displays the maximum and average values for LDEV
response time for reads and writes separately. The maximum values of the read and write response
are displayed within an interval of 30 seconds.
However, HP XP P9000Watch does not display any related metric for the maximum value of read
or write response.
Average values of LDEV response time in HP XP P9000 Performance
Advisor and HP XP P9000Watch
You can calculate the Average Read Response time and Average Write Response time using the
following formulae:
Average read response time
Front–end read response time over the collection interval / total front–end reads
Average write response time
Front-end write response time over the collection interval / total front–end writes
Because HP XP P9000Watch displays the cumulative LDEV response time (that is, both reads and
writes combined) a direct comparison of the average values of LDEV response time in HP XP P9000
Performance Advisor and HP XP P9000Watch is not allowed.
Maximum values of LDEV response time in HP XP P9000 Performance Advisor and HP XP P9000Watch 71