For example –b8K means an 8KB block size, which is relevant for SQL Server Here are some of the command line parameters that you will want to start out with: Parameterīlock size of the I/O, specified as (K/M/G). Once you have the diskspd.exe executable file available, you will need to open a command prompt with administrative rights (by choosing “Run as Administrator”), and then navigate to the directory where you copied the diskspd.exe file. In most cases you will want the 64-bit version of DiskSpd from the amd64fre folder. To make things easier, I always copy the desired diskspd.exe executable file from the appropriate executable folder (amd64fre, armfre or x86fre) to a short, simple path like C:\DiskSpd. In order to do this, you’ll need to download and unzip DiskSpd.
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Now, we are going to dive a little deeper into how to actually use Microsoft DiskSpd to test your storage subsystem without using CrystalDiskMark 4.0. It is extremely useful for synthetic storage subsystem testing when you want a greater level of control than that available in CrystalDiskMark. DiskSpd provides the functionality needed to generate a wide variety of disk request patterns, which can be very helpful in diagnosis and analysis of I/O performance issues with a lot more flexibility than older benchmark tools like SQLIO. CrystalDiskMark was recently rewritten to use Microsoft DiskSpd for its testing, which makes it an even more valuable tool for your initial storage subsystem testing efforts. Previously, I covered the basics of storage subsystem metrics and testing in my article Analyzing I/O Subsystem Performance for SQL Server, including an introduction of CrystalDiskMark 4.0.
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