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Storage subsystem, information processing system and method of controlling I/O interface

  • US 20020052985A1
  • Filed: 07/25/2001
  • Published: 05/02/2002
  • Est. Priority Date: 10/31/2000
  • Status: Active Grant
First Claim
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1. A storage subsystem comprising:

  • plural storage units; and

    a storage control unit that is connected to a central processing unit and has an internal cache memory for temporarily storing data exchanged between said central processing unit and said storage units, wherein;

    said storage subsystem is connected to said central processing unit by an I/O interface protocol by which said central processing unit issues I/O requests consisting of a chain of plural commands and data to said storage control unit asynchronously with responses from said storage control unit;

    said storage control unit has a means that decides order of processing said plural commands and data from said central processing unit independently of the order they were received, and executes said commands; and

    said plural storage units are under control of said storage control unit.

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