Back to results
US 2004/0168034 A1Published application
Storage apparatus and its management method
AssigneeHitachi, Ltd.
InventorsSigeo Homma, Haruaki Watanabe, Yoichi Mizuno, Atsushi Tanaka
Life of this patent
Estimating the term…
Abstract
A storage apparatus controls primary and secondary volumes as a pair, using a logical snapshot management table that indicates in which volume data to be accessed is retained to thereby enable an immediate access to a logical frozen image.
Claims52
A storage apparatus that operates in response to commands from a computer, the storage apparatus comprising:
- a storage region;
- and
- a control unit that operates in response to a first command that correlates a first storage region in the storage region to a second storage region in the storage region, and allows in response to a read instruction to read data in the second storage region copying of the data from the first storage region to the second storage region, and a second command that dissolves the correlation between the first storage region and the second storage region.
A storage apparatus that operates in response to commands from a computer, the storage apparatus comprising:
- a storage region;
- and
- a control unit that operates in response to a first command that causes a first storage region within the storage region to be correlated to a second storage region within the storage region, allows in response to a read instruction to read data in the second storage region copying of the data from the first storage region to the second storage region, allows in response to a write instruction to the second storage region writing of data instructed in the write instruction to the second storage region, and controls copying the data written in the second storage region to the first storage region.
A storage apparatus comprising:
- a storage region;
- and
- a control unit that controls transfer between a first control state that correlates a first storage region within the storage region to a second storage region within the storage region and allows in response to a read instruction to read data in the second storage region copying of the data from the first storage region to the second storage region and a second control state that dissolves the correlation between the first storage region and the second storage region.
A method for managing a storage apparatus having a storage region, the method comprising the steps of:
- in response to a first command from a computer, correlating a first storage region in the storage region to a second storage region in the storage region, and copying data from the first storage region to the second storage region in response to a read instruction from the computer to read the data in the second storage region;
- and
- in response to a second command, dissolving the correlation between the first storage region and the second storage region.
A method for managing a storage apparatus having a storage region, the method comprising the steps of:
- correlating a first storage region within the storage region to a second storage region within the storage region,;
- in response to a read instruction from a computer to read data in the second storage region, copying the data from the first storage region to the second storage region;
- in response to a write instruction from the computer to the second storage region, writing data instructed in the write instruction to the second storage region;
- and
- copying the data written in the second storage region to the first storage region.
2 more elements
A method for managing a storage apparatus having a storage region, the method comprising the steps of:
- controlling transfer between a first control state in which a first storage region within the storage region is correlated to a second storage region within the storage region and a second control state in which the correlation between the first storage region and the second storage region is dissolved;
- and
- in the first control state, in response to a read instruction to read data in the second storage region, copying the data from the first storage region to the second storage region.
A storage apparatus comprising:
- a storage region, wherein a first storage region within the storage region and a second storage region within the storage region are correlated and controlled in a first state, and the first storage region and the second storage region are controlled with the correlation therebetween being dissolved in a second state;
- and
- a control unit that selectively executes a first control mode which dissolves the correlation in order to transfer from the first state to the second state and a second control mode which dissolves the correlation after copying data in the first storage region to the second storage region.
A storage apparatus comprising:
- a storage region, wherein a first storage region within the storage region and a second storage region within the storage region are correlated and controlled in a first state, and the first storage region and the second storage region are controlled with the correlation therebetween being dissolved in a second state;
- and
- a control unit that selectively executes a first control mode which dissolves the correlation in order to transfer from the first state to the second state and a second control mode which dissolves the correlation after copying data in the second storage region to the first storage region.
A storage apparatus comprising:
- a storage region;
- a memory storing management information;
- and
- a control unit that commonly uses the management information stored in the memory as control information for managing correlation between a first storage region within the storage region and a second storage region within the storage region, and as control information for managing correlation of a data status resulting from accesses to data in the first storage region with a data status resulting from accesses to data in the second storage region, and manages the first storage region and the second storage region that store the data.
1 more element
A method for controlling a storage apparatus comprising the steps of:
- controlling primary and secondary volumes as a pair;
- and
- using a logical snapshot management table that indicates which one of the primary and secondary volumes data to be accessed is retained to thereby access to a logical frozen image.
Dependencies are inferred from the claim text.