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US 7,032,070 B2Granted
Method for partial data reallocation in a storage system
AssigneeHitachi, Ltd.
InventorShoji Kodama
Life of this patent
Estimating the term…
Abstract
A method of reallocating data among physical disks corresponding to a logical disk is provided. A logical disk is partitioned into a plurality of groups, each group comprising at least one segment on at least one of a first plurality of physical disks corresponding to the logical disk. One group of the plurality of groups is partitioned into a plurality of sub-groups, and, for each sub-group of the plurality of sub-groups but one, the sub-group is copied to at least one segment on at least one of a second plurality of physical disks corresponding to the logical disk.
Claims15
A method comprising:
- Providing a logical disk configured as a plurality of logical entities, each of the logical entities being configured as a plurality of physical disks;
- Copying at least some portion of data on a first logical entity to at least one physical disk not included in the plurality of logical entities;
- Determining a relatively highly accessed one of the plurality of logical entities;
- and
- Selecting that relatively highly accessed one of the plurality of logical entities for the step of copying.
2 more elements
A method comprising:
- providing a logical disk configured as a plurality of logical entities, each of the logical entities being implemented as a plurality of physical disks;
- and
- dividing at least one logical entity into a plurality of first logical entities, each of the plurality of first logical entities being implemented by a different set of physical disks;
- determining a relatively highly accessed one of the plurality of logical entities;
- and
- selecting that relatively highly accessed one of the plurality of logical entities for the step of dividing.
3 more elements
A storage system comprising:
- A plurality of physical disks;
- and
- A controller coupled to the physical disks, the controller configured to:
- Providing a logical disk configured as a plurality of logical entities, each of the logical entities being implemented with a subset of the plurality of physical disks;
- Copy at least some portion of data on one of the logical entities to at least one physical disk not included in the subset of the plurality of physical disks;
- Determine a relatively highly accessed one of the plurality of logical entities;
- and
- Select that relatively highly accessed one of the plurality of logical entities for the step of copying.
5 more elements
A method comprising:
- Providing a logical disk configured as a plurality of logical entities, each of the logical entities being configured as a plurality of physical disks;
- Copying at least some portion of data on a first logical entity to at least one physical disk not included in the plurality of logical entities;
- and wherein
- The plurality of logical entities include a parity group which is partitioned into two parity groups, each of the logical entities being configured as a plurality of physical disks, the at least one physical disk not included in the plurality of logical entities includes a set of physical disks, and one of the two parity groups is copied to the set of physical disks.
1 more element
A storage system comprising:
- A plurality of physical disks;
- and
- A controller to the physical disks, the controller configured to:
- Provide a logical disk configured as a plurality of logical entities, each of the logical entities being implemented with a subset of the plurality of physical disks;
- Copy at least some portion of data on one of the logical entities to at least one physical disk not included in the subset of the plurality of physical disks;
- Determine a relatively highly accessed one of the plurality of logical entities;
- Select that relatively highly accessed one of the plurality of logical entities for the step of copying;
- Wherein the plurality of logical entities include a parity group which is partitioned into two parity groups, each of the logical entities being configured as a plurality of physical disks, the at least one physical disk not included in the plurality of logical entities includes a set of physical disks, and one of the two parity groups is copied to set of physical disks.
5 more elements
Dependencies are inferred from the claim text.