Patent ID: 9323682
Filing Date: 2016-04-26
CPC Classification: G06F

Claim Text:
1. A method for managing data in a storage device having a front end and a back end, comprising: determining an extent of data stored on storage of the back end of the storage device as an extent demotion candidate subject to demotion at the back end; searching a cache memory of the front end of the storage device for at least some of the data of the demotion candidate; performing an evaluation algorithm based on result of the searching of the cache memory, wherein the evaluation algorithm includes determining whether any data of the demotion candidate stored in the cache memory has been accessed within a threshold amount of time; and based on the evaluation algorithm, determining whether demotion of the demotion candidate is to be delayed at the back end, wherein if it is determined by the evaluation algorithm that any data of the demotion candidate stored in the cache has been accessed within the threshold amount of time, demotion of the demotion candidate at the back end is delayed.