Shadow memory system

Details Shadow memory system Shadow memory system

G - Physics

06

F

354/222, 354/224

G06F 11/20 (2006.01) G06F 1/30 (2006.01) G06F 11/14 (2006.01)

Patent

CA 1228929

ABSTRACT OF THE DISCLOSURE A highly reliable shadow memory system is able to survive multiple fast sequence power failures and includes a volatile main memory and a shadow memory subsystem which continually monitors write accesses to the main memory. The shadow memory subsystem includes a disk drive or shadow memory storing a copy of the data in main memory. As the main memory contents are altered, the shadow memory is continually updated to reflect the changes while main utility power is available. In the event of a main utility power failure, backup power is required to store main memory data in the shadow memory for only a few storage locations for which the updating of theshadow memory may lagmain memory data changes. Consequent- ly, only a small portion of available battery backup power is required to preserve all main memory data and the system can withstand multiple rapid succession power failures without loss of data.

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