HP 6400/8400 Software Manual page 29

3. When the command has completed, open the file in an ASCII editor. Identify any instances where
the IOPS and throughput limits have been exceeded. If the limits have not been exceeded, this
may be a good period to perform the upgrade. For example, as a guideline, values should be
less than 7000 IOPS and less than 70 MB/s.
NOTE:
Another option for displaying HP Command View EVAPerf data is to use the -csv command
option, which saves the data as comma-separated values for importing into a spreadsheet.
This may be useful for analyzing large amounts of data.
Identifying virtual disk activity
If you cannot locate a period that meets the necessary I/O load requirements, it may be possible to
identify specific applications that are imposing heavy I/O loads, and suspend them long enough to
perform the upgrade. This can be done by using HP Command View EVAPerf to view virtual disk
activity.
For example, after running HP Command View EVAPerf, you determine that all the virtual disks on
the storage system are nearly idle with the exception of one virtual disk. To perform an online upgrade,
it may be desirable to halt the application that is imposing the load on the busy virtual disk. This will
be far less disruptive to your environment than performing an offline upgrade.
To view virtual disk activity:
1. Double-click the HP Command View EVAPerf program icon on the desktop. The HP Command
View EVAPerf command window opens.
2. Enter the following command to display virtual disk activity:
evaperf vd –cont
Select an appropriate interval and duration that will enable you to view a period during which
you may want to perform the upgrade. For example, the following command will capture data
at 10 minute intervals for 2 hours on an array named EVA1 and store the output in a file named
virtual_disks:
evaperf vd -cont 600 -dur 7200 -sz EVA1 -fo C:\virtual_disks
HP StorageWorks Enterprise Virtual Array updating product software guide (XCS 09522000)
n –dur n –sz array -fo filename
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