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• Best Practices

• How did Random I/Os Outperform Sequential I/Os?

  Recently, when I was doing some I/O performance tests on an I/O path, I found that 8K random reads (and writes) significantly and consistently outperformed 8K sequential reads (and writes) in terms of I/O throughput (megabytes per second). I was puzzled. Read More... Posted Wednesday, April 04, 2007 4:14 PM by Linchi Shea | 6 Comments Filed under: Performance, Testing, SAN, Storage

• Should I Use a Windows Striped Volume?

  In Windows Server 2003, you can use the Disk Management console to create a striped volume over multiple dynamic disks (well, you can also create a mirrored, a RAID-5 volume, etc). If these disks (or LUNs) are presented from a SAN, most likely you can Read More... Posted Monday, March 12, 2007 1:25 PM by Linchi Shea | 10 Comments Filed under: Performance, Testing, SAN, Storage, Best Practices Attachment(s): WindowsStriped.gif

• Beware of Shifting SAN

  Let’s say you are trying to determine the performance impact of a neat database design change you have just devised on an application. So you run some tests with the existing design and the tests run for several hours. Coming back the next day, you make Read More... Posted Wednesday, January 03, 2007 10:18 PM by Linchi Shea | 2 Comments Filed under: Performance, Testing, SAN, Storage Attachment(s): SANIO.gif