Method and apparatus to restore data redundancy and utilize spare storage spaces
First Claim
1. A method to restore data redundancy, the method comprising:
- receiving input indicating loss of redundancy for first data and second data on a first storage unit;
copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy;
copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy;
mapping logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored; and
mapping logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored, wherein said second data is not copied to said second storage unit in response to said input.
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Accused Products
Abstract
Methods and apparatuses to restore data redundancy in a storage system with a storage virtualization engine. In one aspect of the invention, a method to restore data redundancy includes: receiving input indicating loss of redundancy for first data on a first storage unit; copying the first data from the first storage unit to a second storage unit so that the first data stored on the second storage unit has redundancy; and mapping (or configuring a storage virtualization engine to map) logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored. In one example according to this aspect, a portion of the second storage unit is determined and the first data is copied onto the portion of the second storage unit. The first and second storage units can be in a same storage subsystem under control of a storage controller or in different storage subsystems under control of separated storage controllers (e.g., disk controllers).
22 Citations
18 Claims
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1. A method to restore data redundancy, the method comprising:
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receiving input indicating loss of redundancy for first data and second data on a first storage unit; copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy; copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy; mapping logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored; and mapping logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored, wherein said second data is not copied to said second storage unit in response to said input. - View Dependent Claims (2, 3)
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4. A method to restore data redundancy, the method comprising:
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receiving input indicating loss of redundancy for first data and second data on a first storage unit; copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy; copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy; configuring a storage virtualization engine to map logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored; and configuring the storage virtualization engine to map logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored, wherein said second data is not copied to said second storage unit in response to said input. - View Dependent Claims (5, 6)
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7. A tangible machine readable medium containing executable computer program instructions which when executed by a digital processing system cause said system to perform a method to restore data redundancy, the method comprising:
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receiving input indicating loss of redundancy for first data and second data on a first storage unit; copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy; copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy; mapping logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored; and mapping logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored, wherein said second data is not copied to said second storage unit in response to said input. - View Dependent Claims (8, 9)
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10. A tangible machine readable medium containing executable computer program instructions which when executed by a digital processing system cause said system to perform a method to restore data redundancy, the method comprising:
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receiving input indicating loss of redundancy for first data and second data on a first storage unit; copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy; copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy; configuring a storage virtualization engine to map logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored; and configuring the storage virtualization engine to map logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored, wherein said second data is not copied to said second storage unit in response to said input. - View Dependent Claims (11, 12)
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13. A digital processing system to restore data redundancy, the digital processing system comprising:
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means for receiving input indicating loss of redundancy for first data and second data on a first storage unit; means for copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy; means for copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy; means for mapping logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored; and means for mapping logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored, wherein said second data is not copied to said second storage unit in response to said input. - View Dependent Claims (14, 15)
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16. A digital processing system to restore data redundancy, the digital processing system comprising:
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means for receiving input indicating loss of redundancy for first data and second data on a first storage unit; means for copying the first data from the first storage unit to a second storage unit, the first data stored on the second storage unit having redundancy; means for copying the second data from the first storage unit to a third storage unit, the second data stored on the third storage unit having redundancy; means for configuring a storage virtualization engine to map logical addresses for accessing the first data to physical addresses for the second storage unit in which the first data is stored; and means for configuring the storage virtualization engine to map logical addresses for accessing the second data to physical addresses for the third storage unit in which the second data is stored, wherein said second data is not copied to said second storage unit in response to said input. - View Dependent Claims (17, 18)
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Specification