Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2006-09-22
2009-12-29
Baderman, Scott T (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S043000
Reexamination Certificate
active
07640452
ABSTRACT:
The present invention is to provide a method for reconstructing data in case of failure of two HDs of a RAID, wherein the RAID is a logical disk drive assembly including at least three HDs and a RAID controller and data is divided into block strips which are stored on data blocks of different HDs respectively, The method comprises the steps of reading super blocks of all of the HDs; comparing the number of the HDs and time being involved in a previous operation and stored in the super blocks with each other; reading common data involved in the previous degraded operation of the RAID; writing the read common data into the super blocks of all of the HDs; and recovering a configuration of the RAID to the degraded mode again.
REFERENCES:
patent: 7237062 (2007-06-01), Lubbers et al.
patent: 2005/0283654 (2005-12-01), Wood et al.
patent: 2005/0283655 (2005-12-01), Ashmore
Chen Yi-Chun
Tsai Kun-Ta
Baderman Scott T
Hsu Winston
Patel Jigar
QNAP Systems, Inc.
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