FAULT TOLERANT RELOCATION OF STORAGE WITH ATOMICITY

FAULT TOLERANT RELOCATION OF STORAGE WITH ATOMICITY

A fault tolerant relocation of storage with atomicity method is described for robustly copying pages to system managed storage in order to maintain data in a consistent state and in order to provide continuous access availability of the pages to executing applications. The method achieves data consi...

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Bibliographische Detailangaben
Hauptverfasser: MCASSEY, JOHN JOSEPH, KAMERMAN, ALBERT, BAIRD, ROBERT, LETT, ALEXANDER STAFFORD, BOZMAN, GERALD P, EISENBERGER, GEORGE
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Zusammenfassung:A fault tolerant relocation of storage with atomicity method is described for robustly copying pages to system managed storage in order to maintain data in a consistent state and in order to provide continuous access availability of the pages to executing applications. The method achieves data consistency by atomically shadow copying application referenced pages and amending directories in a failure independent medium on (1) an access with interrupt as well as on (2) a page update basis. Availability is enhanced by duplexing the pages and directories as part of the atomic shadow copying step.