Method and system for data recovery in a continuous data protection system
First Claim
1. A method for data recovery in a continuous data protection system, the system having a primary volume and a secondary volume, the method comprising the steps of:
- (a) selecting a snapshot of the primary volume to be recovered;
(b) selecting a location on which the snapshot is to be loaded;
(c) creating a point in time (PIT) map for the selected snapshot; and
(d) loading the selected snapshot at the selected location.
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Abstract
In a continuous data protection system having a primary volume and a secondary volume, a method for data recovery begins by selecting a snapshot of the primary volume to be recovered and a location on which the snapshot is to be loaded. A point in time (PIT) map is created for the selected snapshot, and the selected snapshot is loaded at the selected location. A data block from the PIT map is resolved to determine which block on the secondary volume is presented as being part of the snapshot. The snapshot is accessed via a host computer as if the snapshot was the primary volume at an earlier point in time, corresponding to the time of the selected snapshot.
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Citations
22 Claims
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1. A method for data recovery in a continuous data protection system, the system having a primary volume and a secondary volume, the method comprising the steps of:
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(a) selecting a snapshot of the primary volume to be recovered;
(b) selecting a location on which the snapshot is to be loaded;
(c) creating a point in time (PIT) map for the selected snapshot; and
(d) loading the selected snapshot at the selected location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for data recovery in a continuous data protection system, comprising:
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a host computer;
a primary data volume;
a secondary data volume;
creating means for creating a snapshot of said primary data volume;
storing means for storing said snapshot on said secondary data volume;
selecting means for selecting a snapshot on said secondary data volume; and
accessing means for accessing said selected snapshot on said host computer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification