Just as a side note when you have this running - If you're using 25Gbit adapters for vSAN you may find that you do not get a full 25Gbit reading when you do the performance test in vCenter.
From what I've read this is down to a single thread limitation in iometer which is what vCenter uses to do the test (you'll probably see around 9000Mbit). The actual bandwidth available to vSAN should be unaffected in practice and run at the 25Gbit speed.
