RAID arrays must implement atomic write operations to properly reproduce single-disk semantics from the perspective of their clients. Atomic operations are required to ensure that component failures do not corrupt stored data. The power dissipation between an optical or electrical transmitter and a receiver. The process of determining what principal a requestor or provider of services is or represents. The process of determining that a requestor is allowed to receive a service or perform an operation.
Access control is an example of authorization.
Synonym for robot. Automatic swaps are functional rather than physical substitutions, and do not require human intervention. Ultimately, however, defective components must be replaced in a physical hot, warm, or cold swap operation. The amount of time that a system is available during those time periods when it is expected to be available. Availability is often measured as a percentage of an elapsed year.