SNIA

A component or collection of components in a system that are always replaced (swapped) as a unit when any part of the collection fails.

Replacement units may be field replaceable, or they may require that the system of which they are part be returned to a factory or repair depot for replacement. Field replaceable units may be customer replaceable, or their replacement may require trained service personnel. Typical replacement units in a disk subsystem include disks, controller logic boards, power supplies, cooling devices, and cables. Replacement units may be cold swappable, warm swappable, or hot swappable.

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