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US 8,914,340 B2Granted
Apparatus, system, and method for relocating storage pool hot spots
AssigneeInternational Business Machines Corporation
InventorsKevin John Ash, Benjamin Jay Donie, Andreas Bernardus Mattias Koster
Life of this patent
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Abstract
An apparatus, system, and method are disclosed for relocating storage pool hot spots. An identification module identifies a hot spot on a first storage pool if accesses to the first storage pool exceed an access threshold. The first storage pool is part of a plurality of storage pools. Each storage pool comprises a plurality of logical segments from a plurality of storage devices. Each storage device is of a specified class. A migration module dynamically migrates data of a first logical segment to a second storage pool. The migration is transparent to a host and the data of the first logical segment is continuously available to the host.
Claims20
A computer program product comprising a non-transitory computer readable storage medium storing a computer readable program, wherein the computer readable program when executed on a computer causes the computer to:
- identify a first storage pool as a hot spot by determining a number of a first plurality of logical segments in the first storage pool with a current usage greater than a use threshold and identifying the first storage pool as the hot spot if the number exceeds an access threshold for a first storage pool, wherein the first plurality of logical segments are in the first storage pool of a plurality of storage pools;
- in response to the number of the first plurality of logical segments with current usage greater than the use threshold exceeding the access threshold, selecting a first logical segment of the first plurality of logical segments that has a greatest number of correctable errors and a highest latency from among the first plurality of logical segments, wherein each storage pool comprises logical segments from a plurality of storage devices, first data of the first logical segment is assigned to a single storage pool according to a storage policy, and each storage device of the first storage pool is of a nearline class;
- and
- dynamically migrate the first data of the first logical segment to a second storage pool, wherein the migration is transparent to a host, the first data of the first logical segment is continuously available to the host, and each storage device of the second storage pool is of an enterprise class.
1 more element
An apparatus for relocating hot spots, the apparatus comprising
- a computer readable storage medium storing a computer readable program;
- a processor and memory executing the computer readable program, the computer readable program comprising:
- an identification module identifying a first storage pool as a hot spot by determining a number of a first plurality of logical segments in the first storage pool with a current usage greater than a use threshold and identifying the first storage pool as the hot spot if the number exceeds an access threshold for a first storage pool, wherein the first plurality of logical segments are in the first storage pool of a plurality of storage pools;
- in response to the number of the first plurality of logical segments with current usage greater than the use threshold exceeding the access threshold, selecting a first logical segment of the first plurality of logical segments that has a greatest number of correctable errors and a highest latency from among the first plurality of logical segments, wherein each storage pool comprises logical segments from a plurality of storage devices, first data of the first logical segments is assigned to a single storage pool according to a storage policy and each storage device of the first storage pool is of a nearline class;
- and
- a migration module dynamically migrating the first data of the first logical segment to a second storage pool, wherein the migration is transparent to a host, the first data of the first logical segment is continuously available to the host, each storage device of the second storage pool is of an enterprise class.
3 more elements
A method for deploying computer infrastructure, comprising integrating a computer readable program into a computing system, wherein the program executed by the computing system performs the following:
- identifying a first storage pool as a hot spot by determining a number of a first plurality of logical segments in the first storage pool with a current usage greater than a use threshold and identifying the first storage pool as the hot spot if the number exceeds an access threshold for a first storage pool, wherein the first plurality of logical segments are in the first storage pool of a plurality of storage pools;
- in response to the number of the first plurality of logical segments with current usage greater than the use threshold exceeding the access threshold, selecting a first logical segment that has a greatest number of correctable errors and a highest latency from among the first plurality of logical segments in a first storage pool, wherein the each storage pool comprises logical segments from a plurality of storage devices, first data of the first logical segment is assigned to a single storage pool according to a storage policy and each storage device of the first storage pool is of a nearline class;
- and
- dynamically migrating the first data of the first logical segment to a second storage pool, wherein the migration is transparent to a host, the first data of the first logical segment is continuously available to the host, and each storage device of the second storage pool is of an enterprise class.
1 more element
A system for relocating hotspots, the system comprising:
- a host;
- a plurality of storage pools organized in a hierarchical storage system, each storage pool comprising a plurality of logical segments from a plurality of storage devices, wherein;
- a controller with a processor executing computer readable code stored on a tangible storage device and comprising
- an identification module identifying a first storage pool as a hot spot by determining a number of a first plurality of logical segments in the first storage pool with a current usage greater than a use threshold and identifying the first storage pool as the hot spot if the number exceeds an access threshold for a first storage pool, wherein the first plurality of logical segments are in the first storage pool of a plurality of storage pools;
- in response to the number of the first plurality of logical segments with current usage greater than the use threshold exceeding the access threshold, selecting a first logical segment of the first plurality of logical segments that has a greatest number of correctable errors and a highest latency from among the first plurality of logical segments, wherein the first data of the hot spot is assigned to a single storage pool according to a storage policy and each storage device of the first storage pool is of a nearline class;
- and
- a migration module dynamically migrating first data of the first logical segment to a second storage pool, wherein the migration is transparent to the host, the first data of the first logical segment is continuously available to the host, and each storage device of the second storage pool is of an enterprise class.
4 more elements
Dependencies are inferred from the claim text.