Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2007-01-23
2007-01-23
Bragdon, Reginald (Department: 2189)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C710S200000, C710S310000, C711S114000, C711S209000, C711S161000, C711S162000
Reexamination Certificate
active
10671035
ABSTRACT:
An apparatus and method provides the capability of mirroring storage from a primary system to a mirrored system in a way that uses parallelism in the mirrored system to maximize the efficiency of writing data to the mirrored storage for operations that do not conflict while serializing operations that do conflict. The mirroring of the present invention is “logical mirroring”, which does not require identical disk drives, and which supports mirroring between geographically remote locations to protect against catastrophic site failure. Parallelism is achieved in the mirrored system by dividing the virtual address space into multiple ranges, and by assigning a group of tasks to each range. When an operation is received on the mirrored system, the virtual address range that the operation affects is determined, and the operation is then delegated to the task group that corresponds to the affected virtual address range. By dividing the virtual address space into ranges, tasks in different ranges (i.e., in different task groups) may execute in parallel without any threat of conflict, and even tasks within the same range may execute in parallel if they operate in different portions of the range.
REFERENCES:
patent: 5899994 (1999-05-01), Mohamed et al.
Griffin Kevin Curtis
Helt Scott Dennis
Nelson Glen Warren
Piazza Mark Philip
Ricard Gary Ross
Bragdon Reginald
Dinh Ngoc
Martin Derek P.
Martin & Associates LLC
LandOfFree
Apparatus and method for writing data to mirrored storage... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for writing data to mirrored storage..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for writing data to mirrored storage... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3769392