Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-10-23
2007-10-23
Elmore, Stephen C. (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S004000, C711S111000, C711S112000, C711S114000, C711S151000, C710S040000, C710S244000
Reexamination Certificate
active
11803916
ABSTRACT:
The invention relates to management of I/O in data storage systems. In an embodiment, the invention provides a data storage subsystem processing I/O requests each having a priority, comprising a processor, a memory coupled to the processor, a disk array, an array controller coupled to the processor and the disk array, a network interface, coupled to the processor, to receive an I/O request with a priority, and a program in the memory for managing the I/O request based on the priority, a clip level of the priority, the total workload in the data storage subsystem, and processing I/O requests based on priority, workload clip levels, and fairness levels. The invention also contemplates the use of static and dynamic adjusted clip levels. The invention also relates to a method of managing I/O requests, comprising receiving an I/O request, determining the priority of the I/O request, comparing the total workload to the clip level for the priority, and processing the I/O request if the total workload is below the clip level or the priority workload is below a fairness level.
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Bagashev Yuri Vladimirovich
Burton David Alan
Miller Wayne Eugene
Otterness Noel Simen
Remley Paul Michael
Elmore Stephen C.
Moll Robert
Pillar Data Systems, Inc.
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