Method and system for preventing deadlock in fibre channel fabrics using frame priorities
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United States of America Patent
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Jan 20, 2009
Issued Date -
N/A
app pub date -
Mar 11, 2004
filing date -
Feb 5, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A method and system for transmitting frames using a fibre channel switch is provided. The method includes, determining a frame's priority based on a hop count for the frame; placing a frame in a priority queue, where the priority queue is dedicated to frames having similar priorities; selecting a frame for transmission based on the frame's priority, if credit is available, where a frame with a higher priority is sent before a frame with a lower priority; and selecting a frame with a lower priority if enough higher priority frames have been sent. The system includes a switch with at least two priority queues for placing frames with different priorities; a counter that keeps track of frames that are transmitted from the two priority queues; and a credit control module that determines if credit is available before sending a particular frame.
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