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

150 Command Line User Interface
Display the three LUN-based metrics identified by the -m option. Limit the
display to the time period of August 5 from 7:00 am to 8:30 am on array with
WWN 2002a00b880005c0.
armperf -c LUN -s 08050700 -e 0805830 -m “Host Reads,
Host Writes,Total I/O” 2002a00b880005c0
Performance Metrics
Table 12 lists the metrics maintained by the array. The categories for which
each metric is available is identified. To determine which specific metrics are
available for an array and each unit within the array, use the
armperf -i command.
Note Not all the performance metrics listed here are available for
display in the Command View SDM GUI.
The performance metrics are retrieved from the array once every polling
interval. The polling interval is set to 15 minutes by default but can be
reconfigured. The values of the performance metrics are reported as the
incremental change that occurred during the polling interval (unless identified
as “absolute”). Any metrics that measure rates or throughputs measure the
average rate or throughput that occurred during the polling interval (unless
otherwise noted).
A single performance metric can be reported for more than one category. The
categories for which metrics can be reported are ARRAY, LUN, DISK, DISK-
PORTS, FRONTEND-PORT, BACKEND-PORT, and OPAQUE (controller).
Unless otherwise noted, values reported for the ARRAY category are computed
as a sum of the corresponding values for the constituent components. For
example, the Host Reads metric reported for the ARRAY category would be the
sum of the Host Reads metric for each configured LUN in the array.
There are some common units of measure referenced by the performance
metrics:
— logical block = 512 bytes
— cache page size = 64 Kbytes = 128 logical blocks
— cluster size = 256 Kbytes = 512 logical blocks
Note In some cases metric names and categories are different in the
1.05 release of Command View SDM or are different for each
product. These differences are identified