Method for controlling storage system, and storage control apparatus
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Abstract
A method for controlling a storage system including a host computer, and a first and a second storage control apparatuses each receiving a data input/output request from the host computer and executing a data input/output process for a storage device in response to the request, comprises connecting a first communication path between the host computer and the first apparatus; connecting a second communication path between the first apparatus and the second apparatus; receiving by the first apparatus a first data input/output request from the host computer through the first path; when the first apparatus has judged that the first request is not for the first apparatus, transmitting by the first apparatus a second data input/output request corresponding to the first request, to the second apparatus through the second path; and by the second apparatus, receiving the second request and executing a data input/output process corresponding to the second request received.
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Citations
53 Claims
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1-48. -48. (canceled)
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49. A method for controlling a storage system including a host computer, and a first and a second storage control apparatuses each having a function for receiving a data input/output request transmitted from said host computer and executing a data input/output process for a storage device in response to said data input/output request received, comprising:
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connecting a first communication path between said host computer and said first storage control apparatus to each other;
connecting a second communication path between said first storage control apparatus and said second storage control apparatus to each other;
collecting information concerning a storage device for which said second storage control apparatus executes data input/output processes;
storing in said first storage control apparatus said information concerning said storage device;
receiving by said first storage control apparatus a first data input/output request transmitted from said host computer through said first communication path;
when said first storage control apparatus has judged that said first data input/output request is not to be handled by said first storage control apparatus based on said information concerning said storage device that said first storage control apparatus stores, transmitting by said first storage control apparatus a second data input/output request corresponding to said first data input/output request, to said second storage control apparatus through said second communication path; and
by said second storage control apparatus, receiving said second data input/output request and executing a data input/output process corresponding to said second data input/output request received. - View Dependent Claims (50, 51, 52)
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53. A method for controlling a storage system including a host computer, and a first and a second storage control apparatuses each having a function for receiving a data input/output request transmitted from said host computer, executing a data input/output process for a storage device in response to said data input/output request received, and organizing a plurality of logic volumes on a storage area provided by said storage device for which said first and said second storage control apparatuses execute respective data input/output processes, comprising:
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connecting a first communication path between said host computer and said first storage control apparatus to each other;
connecting a second communication path between said first storage control apparatus and said second storage control apparatus to each other;
collecting information concerning a storage device for which said second storage control apparatus executes data input/output processes;
storing in said first storage control apparatus said information concerning said storage device;
transmitting by said host computer a first data input/output request directed to a logical volume which is one of said plurality of logic volumes and a target of data input/output processes executed by said second storage control apparatus;
receiving by said first storage control apparatus said first data input/output request directed to said logical volume;
by said first storage control apparatus, judging that said first data input/output request is not to be handled by said first storage control apparatus based on said information concerning said storage device that said first storage control apparatus stores;
transmitting by said first storage control apparatus a second data input/output request corresponding to said first data input/output request, to said second storage control apparatus through said second communication path; and
by said second storage control apparatus, receiving said second data input/output request and executing a data input/output process corresponding to said second data input/output request received.
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Specification