Automated on-line capacity expansion method for storage device
First Claim
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1. An automated capacity expansion method in a volume provider unit connected to at least one host computer and at least one disk device, the method comprising:
- a step of accepting an I/O request to a logical volume from the host computer;
a step of interpreting a logical block address of an access target of the I/O request; and
a step of allocating a storage domain from a free disk device to dynamically expand a storage domain of the logical volume if the storage domain of the logical block address accessed by the I/O request does not exist on the logical volume.
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Abstract
A volume provider unit in a computer system 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 a logical volume capacity reduction or expansion from a host commander part to a volume server.
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Citations
5 Claims
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1. An automated capacity expansion method in a volume provider unit connected to at least one host computer and at least one disk device, the method comprising:
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a step of accepting an I/O request to a logical volume from the host computer;
a step of interpreting a logical block address of an access target of the I/O request; and
a step of allocating a storage domain from a free disk device to dynamically expand a storage domain of the logical volume if the storage domain of the logical block address accessed by the I/O request does not exist on the logical volume. - View Dependent Claims (3)
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2. An automated capacity reduction method in a volume provider unit connected to at least one host computer and at least one disk device, the method comprising:
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a step of accepting a logical volume reduction request from the host computer;
a step of interpreting a logical block address of a target of the reduction request; and
a step of reducing a storage domain of the logical block address specified by the reduction request. - View Dependent Claims (4)
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5. A volume provider apparatus connected to at least one host computer and at least one disk device, the unit comprising:
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means for accepting an I/O request from the host computer to a logical volume;
means for interpreting a logical block address of an access target of the I/O request; and
means for allocating a storage domain from a free disk device to dynamically expand a storage domain of a logical volume if the storage domain of the logical block address accessed by the I/O request does not exist on the logical volume.
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Specification