Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2006-11-21
2006-11-21
Baderman, Scott (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S041000, C714S042000, C711S112000
Reexamination Certificate
active
07139934
ABSTRACT:
A storage system includes a group of storage devices which include back-up devices configured to assure appropriate response time. When a data request from a host computer arrives, and the number of failed devices has changed as shown by a device state management table, a determination is made regarding the number of devices from which to read data. This determination is made based on an indication of redundancy which indicates how many of the disk devices are allowed to be in a failed state at the time of data reading. Typically, the indication of redundancy is determined by the sum of the number of failed devices and a predetermined number. The determined number of devices are selected in accordance with a selection factor, and a selection result is written into a disk management table. Then, the reading process is executed with respect to the target disk devices.
REFERENCES:
patent: 6269424 (2001-07-01), Katsuragi et al.
patent: 6625748 (2003-09-01), Tanaka et al.
patent: 2002/0038436 (2002-03-01), Suzuki
patent: 2002/0055972 (2002-05-01), Weinman
patent: 2002/0188800 (2002-12-01), Tomaszewski et al.
patent: 2003/0033572 (2003-02-01), Walton et al.
patent: 2003/0236919 (2003-12-01), Johnson et al.
patent: 2004/0010661 (2004-01-01), Katsuragi et al.
patent: 2005/0050383 (2005-03-01), Horn et al.
patent: 2005/0188257 (2005-08-01), Morita
patent: 10-247133 (1998-09-01), None
David A. Patterson, et al., “A Case for Redundant Arrays of Inexpensive Disks (RAID)”, Computer Science Division, 1988 ACM 0-89791-268-3/88/0006/0109.
Mario Blaum, et al. “Evenodd: An Optimal Scheme for Tolerating Double Disk Failures in RAID Architectures”. IBM Almaden Research Center, 1063-6897/94 1994 IEEE.
Matsunami Naoto
Nakagawa Yutaka
Nishimoto Akira
Baderman Scott
Gentry David
Hitachi , Ltd.
Townsend and Townsend / and Crew LLP
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