HP StorageWorks Enterprise Virtual Array Online Firmware Upgrade Best Practices (5697-6388, January 2007)

Figure 4 D
etermining the m axim um I/Os per s econ d (IOPS) load for EVA3000/5000
Analyzing storage system utilization using HP Command View EVA Perf
The HP Command View EVAPerf tool can be used to gather and analyze statistics on storage system
utilization. This section provides recommendations on using HP Command View EVAPerf to gather
statistics to help identif y periods of low storage system activity.
If you are not familiar with HP Command View EVAPerf, see the HP StorageWorks Command View EVA
user guide for more information. You may also want to read through the HP Command View EVAPerf
white paper available on the following website:
h
ttp://h18006.www1.hp.com/storage/arraywhitepapers.html
The most impor tant statistics for evaluating the state of the storage system for online firmware upgrades
are the host port statistics (hps) and the virtual disk statistics (vd). The HP Command View EVAPerf
data can be used to calculate the total demand on the storage system by summing the columns for
agivenpointintime.
Capt
uring host port statistics
Use t
he following command to capture the host port statistics:
evaperf hps -csv cont n -dur n -sz array -fo filename
• -csv specifies comm a separated output. This format is useful for importing large amounts of
data into a spreadsheet for ana lysis.
• -co
nt n runs command continuously at interval specified by n. The default interval is one
second.
• -dur n specifies the duration of a continuous mode session. For example, if you enter evaperf
hps
-cont 2 -dur 30, host por t data is displayed at two second intervals for a total of 30 seconds.
HP StorageWorks Enterprise Virtual Array online firmware upgrade best practices
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