One of the major bottlenecks people run in to when deploying a large amount of hosted desktops over shared storage is disk I/O. There have been a lot of discussions surrounding this topic including RAID level, disk speed, number of spindles, IOPS, etc. Some people are even bypassing using shared storage for VDI and using local storage on virtualization hosts. There are arguments for both sides. Two of the more detailed/entertaining arguments are by Brian Madden and Ron Oglesby. Both Brian and Ron have many years of experience with VDI and each one is taking a different side of the argument. Brian argues that you should just use local storage for VDI. While Ron argues that shared storage is the way to go. What do you think? SAN or Local?