Automated on-line capacity expansion method for storage device
First Claim
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1. A system for storing data accessed from a host, comprising:
- a plurality of disk devices, the plurality of disk devices storing data;
an Input/Output (I/O) detector, the I/O detector accepting an I/O request to a logical volume from a host, the capacity of said logical volume managed by an operating system (OS) in a host being larger than a capacity of a physical storage area actually allocated to said logical volume; and
an I/O processor, said I/O processor performing an I/O process according to said I/O request.
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Abstract
A volume provider unit in a computer system that detects a logical block address of a read or write I/O accessing a logical volume of a storage device from a host. According to the logical block address fetched, a storage domain of the logical volume is dynamically expanded. Moreover, the storage domain of the logical volume is reduced or expanded according to an instruction of logical volume capacity reduction or expansion from a host commander part to a volume server.
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6 Claims
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1. A system for storing data accessed from a host, comprising:
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a plurality of disk devices, the plurality of disk devices storing data;
an Input/Output (I/O) detector, the I/O detector accepting an I/O request to a logical volume from a host, the capacity of said logical volume managed by an operating system (OS) in a host being larger than a capacity of a physical storage area actually allocated to said logical volume; and
an I/O processor, said I/O processor performing an I/O process according to said I/O request. - View Dependent Claims (2, 3, 4, 5)
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6. A system for storing data accessed from a host, comprising:
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a plurality of disk devices, said plurality of disk devices storing data; and
a capacity controller, said capacity controller executing a capacity reduction process of a logical volume, wherein said capacity controller receives a capacity reduction request including a reduction size of storage area from a host computer, selects a physical storage area to be deleted from a logical volume according to said reduction size, deletes the selected physical storage area from the logical volume creating a capacity reduced logical volume, and calculates an end logical block address of the capacity reduced logical volume according to said reduction size.
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Specification