Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2006-05-23
2006-05-23
Peikari, B. James (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S113000, C711S114000, C711S161000, C711S163000, C711S165000, C711S166000, C707S793000, C707S793000, C714S005110, C714S006130
Reexamination Certificate
active
07051174
ABSTRACT:
Provided are a method, system, and program for maintaining data in a first cache and second cache, wherein a backup cache maintains a backup copy of data in the first cache, and wherein the first cache is used to cache a first set of data in a storage system and the second cache is used to cache a second set of data in the storage system. An unavailable state of the first cache is detected. In response to detecting the unavailable state, requests to the first set of data are blocked and at least one space in the second cache is allocated for data in the backup cache. Requests to the first set of data are allowed to proceed after the at least one space is allocated in the second cache and before the data in the backup cache is copied to the at least one allocated space in the second cache. The data from the backup cache is copied to the allocated at least one space in the second cache after the requests to the first set of data are allowed to proceed.
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Ash Kevin John
Legvold Vernon J.
Lowe Steven Robert
Mannenbach David Frank
Mellgren Carol Santich
International Business Machines - Corporation
Konrad Raynes & Victor LLP
Li Zhuo H.
Peikari B. James
Victor David W.
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