Method and apparatus for maintaining cache coherency in a...

Details Method and apparatus for maintaining cache coherency in a... Method and apparatus for maintaining cache coherency in a...

2005-06-28

2005-06-28

Bragdon, Reginald G. (Department: 2188)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C711S113000, C711S144000, C711S145000, C711S143000, C711S162000, C711S165000, C711S135000

Reexamination Certificate

active

06912669

ABSTRACT:
A method and apparatus for cache coherency in storage system is disclosed. The invention maintains cache coherency in the controller system of the storage system in a manner to minimize the performance degradation to a host system, and to allow the caches to be coherent without requiring data to be written to the backing disks. Each controller manages an area of memory on the partner controller, but the area is managed dynamically and is done with the information about the partner controller. A first controller determines which mirror cache line on a second controller to copy data into, and then mirrors the data from a first controller cache line to a second controller cache line. A message is sent from the first controller to the second controller informing the second controller of cache meta data associated with the mirror cache line so that the cache line may be added to the second controller's hash table.

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patent: 6574709 (2003-06-01), Skazinski et al.

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