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Using HD_Speed to test I/O performance

Discover how to effectively measure I/O performance using HD_Speed. This tool allows you to evaluate write speeds on your specified drives but comes with a crucial warning: running the test will erase all data on the selected disk. In this guide, learn how to set up the test, including configuring the drive, block size, mode, and duration for optimal results. With practical examples and important safety notes, you can confidently assess your disk performance and compare results against other metrics, such as restore speeds in NetBackup.

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Using HD_Speed to test I/O performance

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  1. Using HD_Speed to test I/O performance Using HD_Speed to test I/O performance

  2. To download HD_Speed, go to: http://www.steelbytes.com/?mid=20 Using HD_Speed to test I/O performance

  3. Testing write performance • *WARNING* Running this test will destroy any data on the selected disk. • For this test example, an 8GB LUN was provisioned to the test machine. • Note: A unique size makes it easy to differentiate from other disks that you do not want to destroy. • The LUN has no file system and is not mounted; the disk is simply visible to the Windows host. • Let the write test run for at least 30 minutes. • In practice, the maximum speed for virtual machine restore is approximately one third of the hardware's maximum speed. Using HD_Speed to test I/O performance

  4. Set the following: Drive(the physical disk you want to test), Block Size (use Automatic to test various block sizes), Mode(set to Write), and Duration (30:00 is recommend). Using HD_Speed to test I/O performance

  5. The program reminds you that any data on the selected disk will be destroyed. Using HD_Speed to test I/O performance

  6. For good measure, a confirmation prompt appears. Using HD_Speed to test I/O performance

  7. This test has only been running for a minute or so. The average write speed is 206.4 MB/second. At that speed, a reasonable VM restore rate is 68.8 MB/second (1/3 of 206.4 MB/second). Note: when performing VM restores, it might take 3 or more concurrent restores to reach that rate. In the graph, steady results are a good sign. Many large blips could indicate SAN issues. Using HD_Speed to test I/O performance

  8. Compare speed test results to NetBackup Detailed Status results from a restore job: To determine your restore speed, use the Detailed Status tab in the NetBackup Activity Monitor to find the read time and kilobytes read. In this example, the restore speed was 30.71 MB/second: 40571363/1024 = 39620.47 MB 39620.47 MB / 1290 seconds = 30.71 MB/sec Using HD_Speed to test I/O performance

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