Patent ID: 6530003
Filing Date: 2003-03-04
Classification: G06F,Y10S

Abstract:
A method for maintaining data coherency in a dual Input/Output(I/O) adapter having primary and secondary adapters, wherein each of the primary and secondary adapters includes resident write cache data and directory storage devices, the method comprising:utilizing a split point to separate each of the cache data and directory storage devices into first and second regions, wherein the first regions in the primary adapter cache data and directory storage devices contain the primary adapter cache data and directory information, respectively, and the second regions in the primary adapter cache data and directory storage devices contain the secondary adapter cache data and directory information, respectively; and mirroring information stored in the primary adapter cache data and directory storage devices into the secondary adapter cache data and storage devices, wherein the first regions in the secondary adapter cache data and directory storage devices contain the primary adapter cache data and directory information, respectively, and the second regions in the secondary adapter cache data and directory storage devices contain the secondary adapter cache data and directory information, respectively.