Apparatus and method for mirroring and restoring data
First Claim
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1. A method for mirroring data of a first storage area, comprising:
- placing a second storage area in a first state, wherein the first state of the second storage area is a state in which updates to the first storage area are made to the second storage area;
mirroring data from the first storage area to the second storage area while the second storage area is in the first state;
changing a state of the second storage area from the first state to a second state in which updates to the first storage area are not made to the second storage area; and
restoring data to the first storage area from the second storage area while maintaining the second storage area in the second state.
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Abstract
An apparatus and method for mirroring data is provided wherein integrity of data on a mirror device is maintained during and after a restore process of data to a standard volume. Because integrity of the mirror is maintained, data from the mirror may be used to perform a later restore to the standard volume if data becomes corrupted, or data is unavailable for any other reason. As a result, the mirror may be used for backup or other operations.
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Citations
35 Claims
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1. A method for mirroring data of a first storage area, comprising:
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placing a second storage area in a first state, wherein the first state of the second storage area is a state in which updates to the first storage area are made to the second storage area; mirroring data from the first storage area to the second storage area while the second storage area is in the first state; changing a state of the second storage area from the first state to a second state in which updates to the first storage area are not made to the second storage area; and restoring data to the first storage area from the second storage area while maintaining the second storage area in the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A storage system comprising:
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a first storage area; a second storage area; and at least one controller that; places the second storage area in a first state, wherein the first state of the second storage area is a state in which updates to the first storage area are made to the second storage area; mirrors data from the first storage area to the second storage area while the second storage area is in the first state; changes a state of the second storage area from the first state to a second state in which updates to the first storage area are not made to the second storage area; and restores data to the first storage area from the second storage area while maintaining the second storage area in the second state. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A computer readable medium encoded with a computer program that, when executed on a computer system, causes the computer system to perform a method comprising acts of:
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placing a second storage area in a first state, wherein the first state of the second storage area is a state in which updates to the first storage area are made to the second storage area; mirroring data from the first storage area to the second storage area while the second storage area is in the first state; changing a state of the second storage area from the first state to a second state in which updates to the first storage area are not made to the second storage area; and restoring data to the first storage area from the second storage area while maintaining the second storage area in the second state. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification