METHODS AND STRUCTURES FOR TESTING SAS-2 SPEED OPTIONS IN SPEED NEGOTIATION WINDOWS
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United States of America Patent
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Feb 14, 2012
Grant Date -
Feb 16, 2012
app pub date -
Mar 26, 2007
filing date -
Mar 26, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Method and structures provide for testing a SAS link during speed negotiation windows to determine success/failure in using a negotiated speed at one or more configured sets of speed options. For each device linked to a master SAS device, each possible set of speed options is configured; the device participates in a speed negotiation window operation with the current speed options configured. One or more SCSI requests are forwarded from the master device to the attached device. The SCSI requests may be non-destructive of data stored on the attached device. Results of the tests may be used to select a preferred speed for communication between the master device and that attached device. The speed options to be varied and tested may include: link speed; spread spectrum clocking for each SAS speed; type of supported spread spectrum clocking; and logical link rate in support of multiplexing.
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