Did any of you ever use a disk duplex setup in a Windows server?  A disk duplex can be achieved using a Windows server that has two raid controllers on which you create two mirrored virtual disks. You than use software mirroring in the OS to create a mirror using those two virtual mirrored disks. That way a raid controller can malfunction completely and your systems stays up. Those kind of setup where hard to find or come by. So what does a geek do when he gets his hands on a Hyper-V host that has access to two EVA 8000 SANs? Well he creates a VM that has two disks. One on EVA 1(RAID 5 or 1 ) , the other on EVA 2 (RAID 5 or 1). When he’s done installing the OS, he converts the Windows basic disk to a dynamic disk and creates a software mirror. The end result: a disk duplex in a Virtual machine. Instead of using to raid controllers we used to SAN’s with storage controllers! I just had to do it, couldn’t resist 🙂