6.1.1 Tools Used for Performance Testing
VMware recommends using any tool that allows for testing with multiple outstanding I/Os for use when testing vSAN. The Health Check plug-in interface now contains performance testing tools. This is by far the easiest way to test the vSAN environment.
Another tool that can be used is Iometer, because it gives the ability to test using a number of different parameters.
Note Tools such as dd and SIO are not recommended for performance testing of vSAN because they can be configured only to run tests that sequentially issue outstanding I/O (OIO) tests.
In addition, VMware has released a tool called the VMware I/O Analyzer that utilizes Iometer for testing. I/O Analyzer is supplied as an easy-to-deploy virtual appliance that automates storage performance testing and analysis through a unified web interface. It can be used to configure and perform storage tests and view graphical results for the tests. I/O Analyzer can be used to run Iometer-based workloads or use application trace replays.