| 摘要 |
A system and method is disclosed for performing maintenance on a mission critical system while minimizing the unavailability of the system to the user. In one embodiment, the mission critical system is provided with software storage/media including at least a production portion and a separately and/or independently accessible/usable maintenance portion. At the time of manufacture and/or installation, the maintenance and production portions are set to be identical, i.e. contain identical software, and the system is programmed to operate from the production portion. During maintenance operations, the system is taken off-line and the particular maintenance procedures are performed only on the maintenance portion of the software storage, leaving the production portion unaltered. Until the maintenance procedures are complete, if the system is required to be available, it may be brought back on-line and directed to continue to operate from the production portion of the software storage. Once the maintenance procedures are complete, the maintenance portion of the software storage is designated as the production portion and the production portion is designated as the maintenance portion. The system is then directed to operate from the newly maintained production portion.
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