초록 ▼

A method of data management for efficiently storing and retrieving data in response to user access requests. The method includes receiving a request from at least one client for a title not resident in a storage server, where the title includes a play track having a plurality of chapters, and then i

A method of data management for efficiently storing and retrieving data in response to user access requests. The method includes receiving a request from at least one client for a title not resident in a storage server, where the title includes a play track having a plurality of chapters, and then initiating retrieval of play track portions proximate chapter delineation points from a secondary storage device. In a case of a client request to begin presentation of the title at one of the chapters, the retrieved portions of the play track chapter are streamed to the client, while unretrieved portions of the play track chapter and subsequent play track portions are retrieved from the secondary storage device.

대표청구항 ▼

A method of data management for efficiently storing and retrieving data in response to user access requests. The method includes receiving a request from at least one client for a title not resident in a storage server, where the title includes a play track having a plurality of chapters, and then i

A method of data management for efficiently storing and retrieving data in response to user access requests. The method includes receiving a request from at least one client for a title not resident in a storage server, where the title includes a play track having a plurality of chapters, and then initiating retrieval of play track portions proximate chapter delineation points from a secondary storage device. In a case of a client request to begin presentation of the title at one of the chapters, the retrieved portions of the play track chapter are streamed to the client, while unretrieved portions of the play track chapter and subsequent play track portions are retrieved from the secondary storage device. controller is isolated from a change in said first variable. 10. A control structure as defined in claim 1 wherein said first controller and said second controller are self-tuned. 11. A control structure as defined in claim 10 wherein said controllers are tuned by a parameter estimation method. 12. A control structure as defined in claim 10 wherein said second controller is tuned by a model reference method. 13. A control structure as defined in claim 1 wherein said first variable is a single input to the control structure. 14. A control structure as defined in claim 13 wherein said variable is a set point. 15. A control structure comprising: a first controller operative to shape a response to a variable; a process model operative to predict output of a process to said variable, said first controller and process model configured in a partitioned feedback loop; and a second controller operative to receive feedback from a process output in a main feedback loop and further operative to receive an input from said predicted output in order to shape a response to an error between said predicted output and said process output; wherein said partitioned feedback loop is configured to generate the predicted output independently of feedback from the main feedback loop. 16. A control structure as defined in claim 15 wherein said controller is tuned to match said set point. 17. A control structure as defined in claim 15 wherein said process receives input from a second variable. 18. A control structure as defined in claim 17 wherein said second variable is a disturbance. 19. A control structure as defined in claim 18 wherein said second controller is tuned to reject said disturbance. 20. A control structure as defined in claim 15 wherein said first controller and said second controller are self-tuned. 21. A control structure as defined in claim 20 wherein said controllers are tuned by a parameter estimation method. 22. A control structure as defined in claim 20 wherein said second controller is tuned by a model reference method. 23. A control structure as defined in claim 15 wherein said first variable is a single input to the control structure. 24. A control structure comprising: a first controller operative to shape a response to a first variable; a process model operative to generate a predicted output of a process to said first variable, said first controller and process model configured in a partitioned feedback loop; and a second controller operative to shape a response to an error, said second controller operative to receive feedback from the process output in a main feedback loop; wherein said partitioned feedback loop is configured so that the process model generates the predicted output independently of feedback from the main feedback loop, and said error, being the difference between said predicted output and a process, is a measure of fitness of said process model to said process, said second controller being operative to test said model such that when said process model substantially matches said process said second controller minimally responds to a change in said first variable. 25. A control structure as defined in claim 24 wherein said first variable is a set point. 26. A control structure as defined in claim 25 wherein said first controller is tuned to match said set point. 27. A control structure as defined in claim 25 wherein said second controller is tuned to reject said disturbance. 28. A control structure as defined in claim 24 wherein said second variable is a disturbance. 29. A control structure as defined in claim 24 wherein said first controller and said second controller are self-tuned. 30. A control structure as defined in claim 29 wherein said controllers are tuned by a parameter estimation method. 31. A control structure as defined in claim 29 wherein said second controller is tuned by a model reference method. 32. A control structure as defined in claim 24 wherein said first variable is a si