RAID Level Comparisons ------------------------------------------------------------------------------------------------------------------------- Level Technique Options Speed Reliablity Usable Capacity Application Mini disk Maxi disk for Data ------------------------------------------------------------------------------------------------------------------------- 0 Striping n/a Highest Lowest 100% High speed, 2 7 normal reliability 1 Mirroring Hot Normal Highest 50% High reliability, 2 2 standby normal speed 5 Striping Hot Lowest Higher 67%-85% High reliability, 3 7 with parity standby low speed is OK 6 Mirroring Hot Highest Highest 50% High reliability, 3 7 and striping standby high speed 7 Individual Tape array Normal Normal 100% Normal reliability, 1 1 disks normal speed