Patent ID: 9460010
Filing Date: 2016-10-04
CPC Classification: G06F

Claim Text:
1. A computer-implemented method for use in managing data storage in a data storage system, wherein the data storage system comprises a data storage device and a cache memory, the method comprising: receiving a write instruction to perform a write operation to write new data to a first section of the data storage device; determining whether the new data is a first update of original data stored in the first section of the data storage device; in response to determining that the new data is a first update of the original data, storing the new data in a first location of the cache memory, and storing the original data in a second location of the cache memory, wherein the original data may be stored in the second location of the cache memory after the new data is stored in the first location of the cache memory; in response to storing the new data in the first location of the cache memory, confirming completion of the write operation, wherein the data storage system is configured to confirm completion of the write operation irrespective of whether the original data is stored in the second location of the cache memory; in response to storing the original data in the second location of the cache memory, enabling the data storage system to de-stage the new data from the first location of the cache memory to first section of the data storage device, wherein the data storage system is configured to prevent overwriting of the original data in the data storage device with the new data until the original data is stored in the second location in the cache memory and the data storage system is enabled to de-stage the new data from the first location of the cache memory to the first section of the data storage device; de-staging the new data in the first location of the cache memory to the first section of the data storage device; and de-staging the original data in the second location of the cache memory to a snapshot storage area in the data storage system.