Select Disk Group >> Change >> RAID Level when application read percentages or application write percentages on a indicate that its current RAID level might not be applicable for the desired performance. Use the Performance Monitor to obtain virtual disk application read percentages and application write percentages.
Applications with a high read percentage perform very well by using RAID 5 or RAID 6 virtual disks because of the outstanding read performance of the RAID 5 and RAID 6 configurations. However, applications with a low read percentage (write-intensive) do not perform as well on RAID 5 virtual disks or RAID 6 virtual disks. The degraded performance is the result of the way that a writes data and data to the disk physical disks in a RAID 5 or RAID 6 . If you experience a low percentage of read activity relative to write activity, you can change the RAID level of a disk group for faster performance.
RAID Level Performance Summary
RAID 0 offers high performance, but RAID 0 does not provide any data redundancy.
RAID 1/10 offers high performance.
RAID 3 is good for large data transfers in applications, such as multimedia or medical imaging, that write and read large sequential chunks of data.
RAID 5 and RAID 6 are good for multiuser environments, such as database or file system storage, where typical I/O size is small and a high proportion of read activity occurs.