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Data caching method of fibre channel switch

A technology of data cache and switch, which is applied in optical fiber transmission, data exchange network, digital transmission system, etc. It can solve the problems of high interface clock frequency, complex read and write logic control circuits, etc., and achieve resource reduction, facilitate implementation, and improve utilization rate Effect

Inactive Publication Date: 2010-12-15
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the shared cache method can improve the utilization rate of the cache, but the clock frequency of the interface between the switch and the shared cache is required to be high, and the data read and write logic control circuit is also relatively complicated.

Method used

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  • Data caching method of fibre channel switch
  • Data caching method of fibre channel switch
  • Data caching method of fibre channel switch

Examples

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] In order to better describe this embodiment, the following definitions are first made:

[0019] The buffer to buffer credit (BB_credit, buffer to buffer credit) value indicates the maximum number of FC data that can be buffered by the input port of the other hardware device connected to the current hardware device. In this embodiment, the current hardware device is also called the source device, that is, the host 2, 3, 4 or the storage device 5, and the opposite hardware device is the FC switch 1.

[0020] The buffer to buffer count (BB_count, buffer to buffer count) value indicates the number of FC data sent by the previous hardware device to the input port of the opposite hardware device connected to the current hardware device.

[0021] RDY data: Indicates that FC switch 1 will send a fixed 32-bit data (that is, 32’hbc954a4a) to th...

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PUM

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Abstract

The invention relates to a data caching method of a fibre channel switch, comprising the following steps: step 81, the input port of a fibre channel (FC) switch is always in a state for monitoring whether FC data arrive at the input port, and the input port immediately sends a data caching request to the FC switch when the fact that FC data arrive is accurately detected; and step 82, when the input port sends the data caching request, the FC switch receives the data caching request, distributes a buffer for FC data in the buffer of the input port immediately, and stores the FC data in a designated buffer. The invention has the beneficial effects that during the process that FC data of the same input port are transmitted to different output ports, the phenomenon of head of line (HOL) blocking does not occur, and data overflow does not occur under the condition that the buffering reaches the controlled cached flow.

Description

technical field [0001] The invention relates to the technical field of fiber channel, and more specifically, the invention relates to a method for caching data of a fiber channel switch. Background technique [0002] A Fiber Channel (FC, Fiber Channel) switch is a hardware device supporting the FC protocol in a storage area network. When other hardware devices supporting the FC protocol, such as hosts or storage systems, are coupled with an FC switch, data transmission between hardware devices can be performed through the FC switch. When a hardware device coupled to an FC switch sends data to another hardware device coupled to an FC switch, the device that sends the data is called the source device, the FC switch is called the intermediate device, and the device that receives the data is called the target device . When multiple source devices send data to a target device through the FC switch, the FC switch needs to cache the data sent by the source device in the buffer in...

Claims

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Application Information

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IPC IPC(8): H04B10/12H04Q11/00H04L12/56H04B10/25H04L12/931
Inventor 涂晓东姜强谢军孟中楼
Owner HUAWEI TECH CO LTD
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