Method of enhancing the performance of storage system through optimization in compressed volume migration
First Claim
1. A method for managing data migration, comprising:
- determining that a plurality of compressed extents, that have been compressed by a first compression algorithm, on a source controller are subject to a data migration process to a target controller, and executing the data migration process, where the data migration process comprises performing sequentially, for each of the plurality of compressed extents;
determining if a current extent of the plurality of compressed extents has already been migrated;
skipping, in response to a determination that the current extent has already been migrated, the current extent;
decompressing, in response to a determination that the current extent has not already been migrated, the current extent to form a decompressed extent;
migrating, in response to the decompressing, the decompressed extent to the target controller;
updating a bitmap of migrated extents to include an indicator that the current extent has been migrated; and
recompressing the decompressed extent utilizing a second compression algorithm;
concurrent with the execution of the data migration process, and in response to receiving an input/output request from a host application for a requested one of the plurality of compressed extents on the source controller, where the requested one has not yet been migrated by the data migration process, inserting an out-of sequence response to the input/output request into the data migration process, where the out-of-sequence response comprises;
decompressing the requested one to form a requested decompressed extent;
migrating the requested decompressed extent to the target controller;
updating the bitmap of migrated extents to include an indicator that the requested one has been migrated;
recompressing the requested one utilizing a second compression algorithm; and
resuming, sequentially, the data migration process.
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Accused Products
Abstract
A data migration management apparatus includes a data migration module, a decompression module, and a consolidation module. The data migration module determines a plurality of compressed extents on a source controller are subject to a data migration process to a target controller. The decompression module receives an input/output request at a storage virtualization controller, from a host application, after the data migration process has begun. A response to the input/output request includes decompressing one of the plurality of compressed extents on the source controller not yet migrated. The consolidation module executes the response to the input/output request and writes to the target controller from a single decompressed extent.
19 Citations
13 Claims
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1. A method for managing data migration, comprising:
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determining that a plurality of compressed extents, that have been compressed by a first compression algorithm, on a source controller are subject to a data migration process to a target controller, and executing the data migration process, where the data migration process comprises performing sequentially, for each of the plurality of compressed extents; determining if a current extent of the plurality of compressed extents has already been migrated; skipping, in response to a determination that the current extent has already been migrated, the current extent; decompressing, in response to a determination that the current extent has not already been migrated, the current extent to form a decompressed extent; migrating, in response to the decompressing, the decompressed extent to the target controller; updating a bitmap of migrated extents to include an indicator that the current extent has been migrated; and recompressing the decompressed extent utilizing a second compression algorithm; concurrent with the execution of the data migration process, and in response to receiving an input/output request from a host application for a requested one of the plurality of compressed extents on the source controller, where the requested one has not yet been migrated by the data migration process, inserting an out-of sequence response to the input/output request into the data migration process, where the out-of-sequence response comprises; decompressing the requested one to form a requested decompressed extent; migrating the requested decompressed extent to the target controller; updating the bitmap of migrated extents to include an indicator that the requested one has been migrated; recompressing the requested one utilizing a second compression algorithm; and resuming, sequentially, the data migration process. - View Dependent Claims (2, 3, 4, 5)
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6. A data migration management apparatus, comprising:
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a data migration module that determines that a plurality of compressed extents, that have been compressed by a first compression algorithm, on a source controller are subject to a data migration process to a target controller, and executes the data migration process, where the data migration process comprises performing sequentially, for each of the plurality of compressed extents; determining if a current extent of the plurality of compressed extents has already been migrated; skipping, in response to a determination that the current extent has already been migrated, the current extent; decompressing, in response to a determination that the current extent has not already been migrated, the current extent to form a decompressed extent; migrating, in response to the decompressing, the decompressed extent to the target controller; updating a bitmap of migrated extents to include an indicator that the current extent has been migrated; and recompressing the decompressed extent utilizing a second compression algorithm; a decompression module that, concurrent with the execution of the data migration process, receives an input/output request from a host application for a requested one of the plurality of compressed extents on the source controller not yet migrated by the data migration process; and a consolidation module that, in response to receiving the input/output request, inserts an out-of-sequence response to the input/output request into the data migration process, where the out-of-sequence response comprises; decompressing the requested one to form a requested decompressed extent; migrating the requested decompressed extent to the target controller; updating the bitmap of migrated extents to include an indicator that the requested one has been migrated; recompressing the requested one utilizing a second compression algorithm; resuming, sequentially, the data migration process. - View Dependent Claims (7, 8, 9, 10)
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11. A computer program product for providing data migration management, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions readable/executable by a processor to cause the processor to:
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determine that a plurality of compressed extents, that have been compressed by a first compression algorithm, on a source controller are subject to a data migration process to a target controller, and execute the data migration process, where the data migration process comprises performing sequentially, for each of the plurality of compressed extents; determining if a current extent of the plurality of compressed extents has already been migrated; skipping, in response to a determination that the current extent has already been migrated, the current extent; decompressing, in response to a determination that the current extent has not already been migrated, the current extent to form a decompressed extent; migrating, in response to the decompressing, the decompressed extent to the target controller; updating a bitmap of migrated extents to include an indicator that the current extent has been migrated; and recompressing the decompressed extent utilizing a second compression algorithm; concurrent with the execution of the data migration process, and in response to receiving an input/output request from a host application for a requested one of the plurality of compressed extents on the source controller not yet migrated by the data migration process, inserting an out-of-sequence response to the input/output request into the data migration process, where the out-of-sequence response comprises; decompressing the requested one to form a requested decompressed extent; migrating the requested decompressed extent to the target controller; updating the bitmap of migrated extents to include an indicator that the requested one has been migrated; recompressing the requested one utilizing a second compression algorithm; resuming, sequentially, the data migration process. - View Dependent Claims (12, 13)
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Specification