Disk Layout and Storage Performance

As you scale the number of hosts on a virtual machine, you must scale storage performance. Understand that different disk types and RAID setups provide different performance profiles. If a single disk in a RAID 0 array fails, the entire array is lost, and all virtual machine disks on that array are unavailable. Using a redundant disk configuration such as RAID 5 or RAID 1+0 for most host servers offers some redundancy but with slightly reduced performance.