Data depulication using short term history
AssigneeInternational Business Machines Corporation
InventorsJonathan Amit, Chaim Koifman
Life of this patent
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Abstract
Exemplary system, and computer program product embodiments for data deduplication using short term history in a computing environment are provided. In one embodiment, by way of example only, a hash value is calculated on data chunks for a read operation. The calculated hash value is stored in a storage media. The calculated hash value is looked up in the storage media to verify if a current write operation was previously written and/or read. Additional system and computer program product embodiments are disclosed and provide related advantages.
Claims18
A system for data deduplication using short term history in a computing environment, comprising:
- a processor device, operable in the computing storage environment and controls the system for the data deduplication, wherein the processor device is adapted for:
- calculating a hash value on data chunks for a read operation of the data chunks from a storage system, wherein the calculated hash value for the read operation of the data chunks from a storage system is stored in storage media;
- calculating an additional hash value for a current write operation to the storage system as part of the data deduplication;
- verifying if data chunks for the current write operation were one of a previously written operation and a previously read operation by looking up the calculated hash value in the storage media and comparing the calculated hash value for the read operation of the data chunks from the storage system to the additional hash value of the data chunks for the current write operation as part of the data deduplication;
- and
- saving, in the storage system, only those portions of the data chunks that were updated or changed during the current write operation if the calculated hash value for the read operation of the data chunks from the storage system matches the additional hash value of the data chunks for the current write operation as part of the data deduplication, wherein the saved portions of the data chunks that were updated or changed do not constitute a new file.
A computer program product for data deduplication using short term history by a processor device, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:
- a first executable portion for calculating a hash value on data chunks for a read operation of the data chunks from a storage system, wherein the calculated hash value for the read operation of the data chunks from a storage system is stored in storage media;
- a second executable s portion for calculating an additional hash value for a current write operation to the storage system as part of the data deduplication;
- a third executable portion for verifying if the data chunks for the current write operation were one of a previously written operation and a previously read operation by looking up the calculated hash value in the storage media and comparing the calculated hash value for the read operation of the data chunks from the storage system to the additional hash value for the current write operation as part of the data deduplication;
- and
- a fourth executable portion for saving, in the storage system, only those portions of the data chunks that were updated or changed in the data chunks during the current write operation if the calculated hash value for the read operation of the data chunks from the storage system matches the additional hash value for the write operation, wherein the saved portions of the data chunks that were updated or changed do not constitute a new file.
Dependencies are inferred from the claim text.