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D Comparing LDEV response time metrics

in XP Performance Advisor and XPWatch

Maximum values of LDEV response time in XP Performance

Advisor and XPWatch

The maximum values of LDEV response time in XP Performance Advisor cannot be compared with the

response time values in XPWatch because XP Performance Advisor displays the I/O response time

as separate metrics for read and write, respectively.

XP 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, XPWatch does not display any related metric for the maximum value of read or write

response.

Average values of LDEV response time in XP Performance

Advisor and XPWatch

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 XPWatch 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 XP Performance Advisor and

XPWatch is not allowed.

XPWatch and XPSketch Reference Guide 61

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Hp XP Performance Advisor Software Manual do Utilizador Página 61