HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array Updating Product Software G - Page 25

the time of day you expect to do the upgrade. This is to familarize yourself with characteristic IOPS and throughput values. For example, the following command will capture data at 10 minute intervals for 6 hours (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 To see your own friendly names, run 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 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, depending on the nature of your configuration, you might decide that in your configuration, periods when values are less than 7000 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 tool (TLViz) to generate graphical representations of performance data. See "Using the HP Command View EVAPerf TLViz formatter" in the HP Command View EVA User Guide for more information. 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 n -dur n -sz array -fo filename 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 Selecting an appropriate time to perform an online upgrade 25