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Method and apparatus for SAS speed adjustment

  • US 20110191637A1
  • Filed: 07/21/2010
  • Published: 08/04/2011
  • Est. Priority Date: 02/04/2010
  • Status: Active Grant
First Claim
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1. A method for maintaining reliable communication between a command initiator and a target device, comprising:

  • detecting, by the command initiator, an error corresponding to the target device;

    determining, by the command initiator, that the error corresponds to one of a protocol error, a drive detected error, and a target device timeout;

    performing, by the command initiator, a downshift evaluation for a path between the command initiator and the target device;

    in response to performing the downshift evaluation for the path,maintaining a transmission speed of the path if the downshift evaluation determines that forgoing transmission speed downshift is required for the path; and

    reducing the transmission speed of the path if the downshift evaluation determines that transmission speed downshift is required for the path;

    logging the downshift evaluation result; and

    reporting any transmission speed change for the path to a user.

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