Storage apparatus system and method of data backup
First Claim
1. For use in an information processing system including a host computer, a main storage apparatus system, and a sub-storage apparatus system which is electrically connected to said main storage apparatus system, a method of carrying out back-up of the data from said main storage apparatus system to said substorage apparatus system, comprising the steps of:
- sending an instruction to maintain the state of the data in said main storage apparatus system from said host computer to said main storage apparatus system;
maintaining the state of the data in said main storage apparatus system at a time point when said instruction has been issued; and
structuring the data, which said main storage system has at a time point when said instruction has been issued, on said sub-storage apparatus system on the basis of the maintained data.
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Accused Products
Abstract
In a storage apparatus system, after having obtained the coherency between a file system of a main storage apparatus system and the stored data, a host computer issues a freezing instruction to a main DKC which transfers in turn the disk image at a time point of the issue of freezing instruction to a sub-DKC and then transmits a signal, showing that all the data has been transmitted, to the sub-DKC. In the sub-DKC, the disk image at a time point of reception of the freezing instruction is held until a signal showing that all the data has been transmitted is issued next time, and when the main storage apparatus system becomes unusable at an arbitrary time point, the data of the disk image, at a time point of issue of the freezing instruction, which is held by the sub-storage apparatus system can be utilized.
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Citations
16 Claims
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1. For use in an information processing system including a host computer, a main storage apparatus system, and a sub-storage apparatus system which is electrically connected to said main storage apparatus system, a method of carrying out back-up of the data from said main storage apparatus system to said substorage apparatus system, comprising the steps of:
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sending an instruction to maintain the state of the data in said main storage apparatus system from said host computer to said main storage apparatus system;
maintaining the state of the data in said main storage apparatus system at a time point when said instruction has been issued; and
structuring the data, which said main storage system has at a time point when said instruction has been issued, on said sub-storage apparatus system on the basis of the maintained data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A storage apparatus system, comprising:
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a main storage apparatus system which has a first storage area, a second storage area and a main disk controller and which is electrically connected to a host computer; and
a sub-storage apparatus system which has a third storage area, a fourth storage area and a sub-disk controller and which is electrically connected to said main storage apparatus system, wherein said main disk controller has;
means for recording the data, which has been sent from said host computer, in said first storage area until said host computer has issued an instruction for freezing;
means for in response to the freezing instruction issued from said host computer, copying the data which has been recorded in said first storage area to said second storage area; and
means for sending the copied data to said sub-storage apparatus system, and wherein said sub-disk controller has;
means for receiving the data sent thereto to hold the data thus received in said third storage area; and
means for structuring the data, which is held in said first storage area at a time point when said host computer has issued the freezing instruction, in said fourth storage area using the data held in said third storage area.
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12. A storage apparatus system, comprising:
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a main storage apparatus system which has a first storage area, a second storage area and a main disk controller and which is electrically connected to a host computer; and
a sub-storage apparatus system which has a third storage area, a fourth storage area and a sub-disk controller and which is electrically connected to said main storage apparatus system, wherein said main disk controller has;
means for recording therein the data, which has been sent from said host computer, in said first storage area until said host computer has issued an instruction for freezing;
means for sending a difference between the data which is stored in said first storage area at a predetermined time point and the data which is recorded to said sub-storage apparatus system;
means for in response to the freezing instruction issued from said host computer, with respect to writing of the data to said first storage area by said host computer, when the difference between the data each becoming an object has already been sent to said sub-storage apparatus system, writing the data to said first storage area; and
means for when the difference between the data each becoming an object is not yet sent to said sub-storage apparatus system, writing the data to said second storage area, and wherein said disk controller has;
means for receiving the difference sent thereto to hold the difference thus received in said third-storage area; and
means for structuring the data, which is held in said first storage area at a time point when said host computer has issued the freezing instruction, in said fourth storage area using the difference held in said third storage area.
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13. A storage apparatus system, comprising:
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a main storage apparatus system which has a first storage area, a second storage area and a main disk controller and which is electrically connected to a host computer; and
a sub-storage apparatus system which has a third storage area, a fourth storage area and a sub-disk controller and which is electrically connected to said main storage apparatus system, wherein said main disk controller has;
means for recording therein the data, which has been sent from said host computer, in said first storage area until said host computer has issued an instruction for freezing;
means for sending the data stored in said first storage area to said sub-storage apparatus system;
means for in response to the freezing instruction issued from said host computer, copying the data stored in said first storage area to said second storage area; and
means for sending the copied data to said sub-storage apparatus system, and wherein said sub-disk controller has;
means for receiving both of the data which has been sent to be stored in said first storage area and the copied data to hold both of the data in said third storage area; and
means for structuring the data, which is held in said first storage area at a time point when said host computer has issued the freezing instruction, in said fourth storage area using the data stored in said third storage area. - View Dependent Claims (14, 15, 16)
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Specification