HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array Updating Product Software G - Page 24

If you are unfamiliar with HP Command View EVAPerf, see the "Monitoring array performance" chapter of the HP Command View EVA User Guide for more information. See Table 1 (page 7) for the link to this guide. Tips for using HP Command View EVAPerf Use HP Command View EVAPerf to identify periods of low I/O activity, during which you can safely perform on online 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 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 period several more times to ensure the low I/O pattern is repeatable. • When you have selected a potential time period for the upgrade, perform the following steps to ensure I/O activity does 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 load during the upgrade period, including backup applications and scripts. Ensure these processes are suspended for the duration of the upgrade. HP Command View EVAPerf command options The following options are used with the HP Command View EVAPerf commands: • -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 port 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: Directs 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 IOPS (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, collect data once every 10 minutes for a period of 6 hours around 24 Pre-upgrade tasks