HP 6400/8400 HP StorageWorks Enterprise Virtual Array Updating Product Softwar - Page 28

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 World Wide Name (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), where n is the interval in seconds and m is the duration in seconds: evaperf as -cont n -dur m -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 the time of day you plan to do the upgrade. This is to familiarize yourself with characteristic IOPS and throughput values. For example, the following command will capture data at 10 minute intervals (60*10) for 6 hours (60*60*6) on an array named EVA1 and store the output in a file named EVA_upgrade: evaperf as -cont 600 -dur 21600 -sz EVA1 -fo C:\EVA_upgrade You can store the data in a folder or drive of your choice. (To see your own friendly names, run HP Command View EVAPerf with the fnh command and list the names with the EVAPerf ls command.) 3. When the command has completed, open the file in an ASCII editor. Identify and exclude instances where IOPS and throughput limits have been exceeded. Instances where limits have not been exceeded and where IOPS and throughout are at a minimum are periods to consider for performing the upgrade. For example, depending on the nature of your configuration, you might decide that in your configuration, periods when values are less than 7,000 IOPS and less than 70 MB/s would be appropriate for performing the upgrade. 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. You can also use the HP TimeLine Visualizer TLViz tool to generate graphical representations of performance data. See "Using the HP Command View EVAPerf TLViz formatter" in the HP StorageWorks Command View EVA User Guide for more information. 28 Preparing for the upgrade