HP LeftHand SAN Solutions

Transcription

1 HP LeftHand SAN Solutions Support Document Application Notes Best Practices for Collecting Performance Monitor Logs

2 Legal Notices Warranty The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. The information contained herein is subject to change without notice. Restricted Rights Legend Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR and , Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor's standard commercial license. Copyright Notices Copyright 2009 Hewlett-Packard Development Company, L.P. 2

3 Measuring Windows 2000/2003 Performance in a SAN/iQ Environment Overview This paper describes how to measure performance on a Windows system connected to a volume on the SAN. Using Windows Performance Monitor to Measure SAN Performance As a supplement to the data provided in the SAN/iQ Performance Monitor, a preferred method to measure application server performance connected to the SAN is to use Windows Performance Monitor (perfmon.exe) and sample the appropriate PhysicalDisk counters for the SAN volume(s) in question. The following are relevant performance counters and what they measure: Windows Performance Counter SAN Measurement Notes Avg. Disk Sec/Read Avg. Disk Sec/Transfer Avg. Disk Sec/Write Avg. Disk Queue Length Current Disk Queue Length Disk Bytes/sec Read I/O Latency of the volume I/O (Read & Write) Latency of Write I/O Latency of the volume Average # of pending I/O requests for Current # of pending I/O requests for Total data throughput for Measured in Seconds. Typical values are in milliseconds. Measured in Seconds. Typical values are in milliseconds. Measured in Seconds. Typical values are in milliseconds. Measured in Bytes/sec. Typical values are in Megabytes/sec. 3

4 Windows Performance Counter SAN Measurement Notes Disk Read Bytes/sec Disk Write Bytes/sec Disk Reads/sec Disk Writes/sec Disk Transfers/sec Read data throughput for Write data throughput for Read IOPS (I/Os / sec) for Write IOPS (I/Os / sec) for Total IOPS (I/Os / sec) for Measured in Bytes/sec. Typical values are in Megabytes/sec. Measured in Bytes/sec. Typical values are in Megabytes/sec. Setting up Windows Performance Monitor 1 Open Windows Performance Monitor (Start Menu>Accessories>System Tools>Performance Monitor, or run the perfmon.exe program). 2 Click the X icon several times to remove any existing counters. 3 Click the + icon or right-click on the graph area to open the Add Counters function. 4 Configure the Add Counters window as shown below. Make sure to include all counters listed above. (To simplify the process, choose All counters from the column on the left to avoid having to individually select counters). Add the PhysicalDisk counters listed in the table above, and then click the Add button 5 Make sure to choose the proper physical disks from the section on the right. Unless directed to do otherwise, select all disk instances and do not choose the _Total. Selecting all the individual disks allows for a more detailed analysis of the performance data. 6 Select Close. *Choosing the view report icon rather than the view graph icon will generally reveal more useable results. 4

5 Saving A Performance Monitor Log For Analysis It is common for Administrators to monitor performance on a longer-run basis. If needed, setup a performance counter log by expanding Performance Logs and Alerts, right-click Counter Logs, and select New Log Settings. 5

6 Provide a meaningful name and select OK. In the resulting window, note the path to the resulting log file, and then select Add Counters. Add the counters similar to setting up Performance Monitor above, finishing with Add button, then select Close. 6

7 Note: The output file can be saved as a binary log (blg) or a comma-separated file (csv). To change the output format, select the Log Files tab. The.blg format file can be viewed later in Performance Monitor. The.csv file can be imported into a spreadsheet or database for further analysis. Monitoring more than one Server Simultaneously When collecting data from multiple servers, you can collect all data from a single perfmon instance by changing the server name in the Select counters from computer: box. The appropriate physical drives will show up for that server. 7

8 Scheduling Performance Data Collection Data collection can be scheduled using the Performance Monitor tool. To enable scheduling, right-click on a log that has been created, and select Properties. Go to the Schedule tab to set up the start and stop time for the performance data logging. The most value comes from a schedule that encompasses typical workloads, so it is suggested that the schedule be set to include times with peak loads, such as backups, end-of-week batch processing jobs, or other times when the SAN is heavily utilized. Depending on the individual environment, this schedule could last for 24 hours to one week. Typically, logging of less than 24 hours does not represent a standard workload. 8

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