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Method and system for un-tagged command queuing

A command and mark technology, applied in the direction of transmission system, digital transmission system, input/output to record carrier, etc., can solve the problems of lost data input/output interruption, inability to process commands, re-execution and restart, etc.

Inactive Publication Date: 2002-07-17
CROSSROADS SYST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may result in corruption or loss of data and interruption of input / output between the host and target device
Because current command processing systems and methods cannot handle marked commands (or multiple concurrent commands, whether marked or unmarked), for streaming target devices, certain runs may have to be completely re-executed and not simply restarted

Method used

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  • Method and system for un-tagged command queuing
  • Method and system for un-tagged command queuing
  • Method and system for un-tagged command queuing

Examples

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Embodiment Construction

[0028]The preferred embodiment of the present invention is illustrated in the drawings and like numerals are used to indicate like and corresponding parts in the various drawings.

[0029] In a Fiber Channel-SCSI network, the present invention provides the ability to process tagged commands sent through SCSI routers to streaming target devices, which may not support tagged commands. If a Fiber Channel host driver supports only random access devices that can accept tag commands, such as disk drives, it may only issue tag commands that are not supported by certain streaming target devices (eg, tape backup devices). The method and system for processing tagged commands to a streaming target device of the present invention converts tagged commands from a Fiber Channel host into an untagged command format so that the streaming target device does not reject it. Instead the converted command can be treated by the streaming target device like any other non-marked command and executed a...

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Abstract

A method and system are disclosed for processing tagged commands from a Fibre Channel host (14, 22) in a Fibre Channel network (10) to one or more SCSI streaming target devices (18, 28, 32, 34) through an SCSI route (16, 30). The method includes the step of determining whether the command is a tagged command. If the command is a tagged command, then the command processing method of the current invention determines whether the intended target device (18, 28, 32, 34) is a streaming target device. If the intended target device (18, 28, 32, 34) is a streaming target device, the method and system of the present invention can convert the command's format from a tagged command format to an un-tagged format and forward the command to the intended target device (18, 28, 32, 34). Flags in an internal SCSI router register (17, 19) can be set to track which, if any, devices attached to the SCSI router (16, 30) can support tagged commands. Upon completion of the command, the method of the present invention can forward the command complete message to the issuing Fibre Channel host (14, 22).

Description

technical field [0001] The present invention relates generally to data and information communication systems and their operation, and more particularly to communication networks, including fiber channel networks. Even more particularly, the present invention relates to a Fiber Channel-SCSI (Small Computer System Interface) network system and method of operation having the ability to convert tagged commands for streaming target devices into an untagged command format by processing in a SCSI router ability to improve network performance and avoid data loss that may occur due to sending marked commands to streaming target devices. Background technique [0002] In a Fiber Channel-SCSI router architecture, one SCSI initiator (interface), such as a SCSI router, may talk to SCSI targets on behalf of many Fiber Channel initiators (hosts). These Fiber Channel hosts may be attached to SCSI routers from many different interfaces. However, a SCSI target is only known to interface with...

Claims

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Application Information

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IPC IPC(8): G06F13/12G06F3/06G06F13/00H04L12/46H04L12/56
CPCG06F3/0619G06F3/067G06F3/0659
Inventor 基思·M·阿罗友
Owner CROSSROADS SYST
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