Method for reducing data/parity inconsistencies due to a...

Details Method for reducing data/parity inconsistencies due to a... Method for reducing data/parity inconsistencies due to a...

2005-02-22

2005-02-22

Beausoliel, Robert (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S006130, C714S010000, C714S011000

Reexamination Certificate

active

06859890

ABSTRACT:
A method for reducing data/parity inconsistencies due to a storage controller failure in computer storage systems with dual, independent storage controllers and a number of logical volumes comprising one or more physical disk drive devices includes recognizing a failure of the storage controller; assuming access control of the volume; and thereafter, performing at least one write to the volume, wherein, for a predetermined number of writes (N) to the volume after failure of the storage controller, new parity is calculated for the write using new data and other data (Method 2). The predetermined number of writes (N) is at least equal to or greater than the queue depth of the failed storage controller (i.e., the number of I/O operations that the failed storage controller may service at a given time. The method may be implemented by each storage controller of the computer storage system.

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