Snapshot maintenance apparatus and method
First Claim
1. A snapshot maintenance apparatus for maintaining an image at the time of creating a snapshot of an operation volume for reading and writing data from and to a host system, comprising:
- a volume setting unit for setting a difference volume and a failure-situation volume in a connected physical device; and
a snapshot management unit for sequentially saving difference data, which is the difference formed from said operation volume at the time of creating said snapshot and the current operation volume, in said difference volume according to the writing of said data from said host system in said operation volume, and saving said difference data in said failure-situation volume when a failure occurs in said difference volume.
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Accused Products
Abstract
Provided is a snapshot maintenance apparatus and method capable of maintaining a snapshot in a highly reliability manner. In a snapshot maintenance apparatus and method for maintaining an image at the time of creating a snapshot of an operation volume for reading and writing data from and to a host system, a difference volume and a failure-situation volume are set in a connected physical device; and difference data, which is the difference formed from the operation volume at the time of creating the snapshot and the current operation volume, is sequentially saved in the difference volume according to the writing of the data from the host system in the operation volume, and the difference data is saved in the failure-situation volume when a failure occurs in the difference volume.
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Citations
16 Claims
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1. A snapshot maintenance apparatus for maintaining an image at the time of creating a snapshot of an operation volume for reading and writing data from and to a host system, comprising:
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a volume setting unit for setting a difference volume and a failure-situation volume in a connected physical device; and
a snapshot management unit for sequentially saving difference data, which is the difference formed from said operation volume at the time of creating said snapshot and the current operation volume, in said difference volume according to the writing of said data from said host system in said operation volume, and saving said difference data in said failure-situation volume when a failure occurs in said difference volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14)
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9. A snapshot maintenance method for maintaining an image at the time of creating a snapshot of an operation volume for reading and writing data from and to a host system, comprising:
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a first step of setting a difference volume and a failure-situation volume in a connected physical device; and
a second step of sequentially saving difference data, which is the difference formed from said operation volume at the time of creating said snapshot and the current operation volume, in said difference volume according to the writing of said data from said host system in said operation volume, and saving said difference data in said failure-situation volume when a failure occurs in said difference volume. - View Dependent Claims (15, 16)
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Specification