When choosing a disk array, the user balances performance, availability and cost. Other array management and fault tolerance features should also be evaluated with special attention paid to thermal management, scaled warning indicators and remote monitoring features. Notes Storage capacity doubles for the same cost every 18 months. However, it has been modified to reflect changing economics and technology including RAID being used with tape drives as well as disk drives. MTBF for an array of disks is defined as MTBF of an individual drive divided by the number of drives in the array.
Parity is the information stored to provide error correction in case of drive problems or failure.
Electronic components double their working life for every 18 F drop in operating temperature.