Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2007-11-06
2007-11-06
Shah, Sanjiv (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S158000, C710S040000
Reexamination Certificate
active
11208291
ABSTRACT:
Storage requests are divided into high-priority requests generally requiring low response time and low-priority requests generally requiring high throughput. The high-priority requests are further divided into several priorities reflecting different classes of service. The low-priority requests are placed on a low-priority request queue where they are executed in a throughput-optimizing order generally different from their arrival order. For each high-priority request, if there are not more than a predetermined number n (e.g., 1) outstanding requests for execution by the disk drive of greater priority, then the request is placed on a high-priority request queue where it is generally executed ahead of requests on the low-priority request queue. If there are more than n such greater-priority requests outstanding, then the high-priority request is placed on the low priority request queue and included in the throughput optimization along with the low-priority requests. The number of priority levels for the high priority requests may be two or more, and in one illustrated embodiment is equal to three.
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Glynn William J.
More Sachin Suresh
Sahin Adnan
BainwoodHuang
EMC Corporation
Shah Sanjiv
Tsui Daniel
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