Topic: power fail recovery

topics > computer science > Group: security

database security
error safe systems
safety critical systems
operating system security
process control systems


All computer systems should recover gracefully from a power failure. Process control systems should provide automatic full recovery. Non-volatile memory, such as core, EAROM memory, or battery backup allows full state save for latter recovery. Automatic mass storage reload allows system re-initialization on restart. This capability may also be initialized on soft system failure. Some system state is often lost on power fail and database integrity may be suspect. The restart task should clean up the system and its databases. Then, active tasks can be continued, restarted, or terminated. Since a power fail may happen at any time, careful design is needed for successful power fail recovery. An uninterruptible power supply (UPS) allows the system to shut down in a safe state. (cbb 5/80)
Subtopic: power fail recovery up

Quote: a control system must have power-fail/auto-restart; by sensing power-on or via a watchdog system [»instrumentcontrol]
Quote: a task has three options on power-fail restart; restart at specified step, resume execution, or terminate [»weavAC_1978]

Subtopic: non-volatile memory up

QuoteRef: controleng ;;6/77 11 Cincinnati Milacron Maximiser PC for $1413 first use of "non-volatile (EAROM) R/W memory which doesn't require battery backup and can be loaded with a new program via cassette in less than a minute and a half.

Subtopic: uninteruptible power supply up

Quote: implement a safe file cache with battery-backed memory [»chenPM9_1996]
QuoteRef: instrumentcontrol ;;4/77 57 Boyle PW: "An inexpensive battery-powered UPS (uninterruptible power supply) using nickel-cadmium batteries will keep microprocessors functioning throughout all types of power interruptions.

Subtopic: notification up

QuoteRef: lampL1_1976 ;;18 [This allows one processor to go down and change some condition which flags other processors that have trouble

Related Topics up

Topic: database security (12 items)
Topic: error safe systems (76 items)
Topic: safety critical systems (32 items)
Topic: operating system security (18 items)
Topic: process control systems
(3 items)

Updated barberCB 11/04
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