Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2006-02-07
2006-02-07
Sparks, Donald (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S113000, C711S118000, C711S119000, C711S120000, C711S122000, C711S137000, C711S141000, C709S241000, C709S201000, C709S203000, C709S218000, C709S219000, C709S224000, C709S236000
Reexamination Certificate
active
06996674
ABSTRACT:
A method, apparatus, and article of manufacture provide the ability to maintain cache in a clustered environment. The cache is maintained in both a primary and secondary node. When data is requested, a symbolic list in a cache directory is examined to determine which node's cache contains the requested data. If the symbolic list indicates data is not currently in cache of any node, any node may be used as the secondary node. However, if an original primary node maintains the data in cache, the original primary node is selected as the secondary node. Once a new write I/O operation is performed, the symbolic list is updated to provide. To install a new node, after applying for cluster admission, symbolic information and a modified track list is requested. The modified track list is merged with new symbolic entries and the new node then broadcasts its availability to the cluster.
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Chiu Lawrence Yium-chee
Hsu Windsor Wee Sun
Young Honesty Cheng
Farrokh Hashem
Gates & Cooper LLP
International Business Machines - Corporation
Sparks Donald
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