HP StorageWorks Command View SDM Installation and User Guide (T1086-96023, February 2005)

176 Command Line User Interface
Read Command Latency range ARRAY
LUN
The number of read commands that were received and
completed within the time range specified by the metric.
The supported time ranges are:
0-2.55 ms
2.56-5.11 ms
5.12-10.23 ms
10.24-20.47 ms
20.48-40.95 ms
40.96-81.91 ms
81.92-163.83 ms
163.84-327.67 ms
327.68-655.35 ms
>655.35 ms
The following additional time ranges are supported only
on VA 7410:
655.36ms-1.30S
1.31-2.61S
2.62-5.23S
5.24-10.47S
10.48-20.95S
20.96-41.91S
41.92-83.83S
83.84-167.67S
>167.68S
Usage
This set of metrics provides a summary of the response
time performance being achieved for read commands.
The measured latency for a command includes all delays
that occur during the processing of the command both
inside and outside the array. If significant host channel
delays are being encountered, they cannot be separated
from the internal array processing time of a command by
this set of metrics. In this case this set of metrics may not
accurately reflect the performance capability of the array.
The latency is measured from the time the command is
received by the array through the completion of the data
transfer for the command. The time required for command
status transfer is not included.
Table 12 Performance Metrics (Continued)
Metric Categories Description/Usage