8x00 Enterprise Virtual Array updating product software guide (XCS 6.200) (5697-7958, February 2009)

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Tips for using HP

Command View EVAPerf

Use HP Command Vi

ew EVAPerf to identify perio ds of low I/O activity, during which you can safely

perform on onli

ne upgrade of the storage system ﬁrmware. Use the following tips to ensure that you select

an appropriate

period during which I/O is low and remains low.

NOTE:

Before using HP Command View EVAPerf, you may want to conﬁgure friendly names to simplify

identifying your storage systems, virtual disks, and hosts. See the HP StorageWorks Command View EVA

user guide for more information about friendly names.

• Identify a period of time when you anticipate the I/O load on the storage system will be low. This

is the window to focus on when running HP Command View EVAPerf to gather I/O data.

• Run HP Command View EVAPerf to gather I/O data during the chosen window. For example, if

you suspect that I/O load may be low between midnight and 2 AM on Sunday morning, run HP

Command View EVAPerf during this period.

• If the I/O pattern is low, capture the data over the same time perio d several more times to ensure

the low I/O pat tern is repeatable.

• When you have selected a potential tim e period for the upgrade, perform the following steps to

ensure I/O activity d oes not increase unexpectedly during the upgrade:

• Alert all system users of the need to minimize the load on the storage system during the time

period you have selected for the upgrade.

• Identify any automated processes that may increase I/O loa d during the upgrade period,

including backup applications and scripts. Ensure these processes a re suspended for the

duration of the upgrade.

HP Command View EVAPerf command options

The following op tions are used with the HP Command View EVAPerf com m a nds:

• -csv: Use comma separated output. This format is useful for importing large amounts of data

into a spreadsheet for analysis.

• -cont n: Runs the command continuously at an 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.

• -sz array: Limits data collection to the speciﬁed array(s). You must enter at least one array

and can use either the storage system WWN or friendly name.

• -fo filename: D irects output to a speciﬁed ﬁlename. Include the path information as

necessary.

Running HP Command View EVAPerf

1. Double-click the HP Command View EVAPerf icon on the desktop. The HP Command View EVAPerf

command window opens.

2. Enter the following command to capture and display the total IO PS (Req/s) and throughput (MB/s):

evaperf as -cont n –dur n –sz array -fo filename

Select an interval and duration that will enable you to view a period that may include a low I/O

activity. For example, the following command will capture data at 15 second intervals for 2 hours on

an array named EVA1 and store the output in a ﬁle named EVA_ upgrade:

evaperf as –cont 15 –dur 7200 –sz EVA1 -fo C:\EVA_upgrade

Pre-upgrade tasks