Patent ID: 8924665
Filing Date: 2014-12-30
Classification: G06F,Y10S

Abstract:
1. A method for a primary storage device to maintain recovery data in connection with ordering data writes, comprising: the primary storage device receiving a plurality of data writes; the primary storage device associating data writes begun after a first time and before a second time with a first chunk of data; the primary storage device associating data writes begun after the second time with a second chunk of data different from the first chunk of data; after completion of all writes associated with the first chunk of data, the primary storage device initiating transfer of writes associated with the first chunk of data to a secondary storage device, wherein the primary storage device maintains a transfer log of data from the first chunk that is successfully transferred to the secondary storage device, the transfer log including a copy of the data that is transferred along with an identifier indicating that the data is part of the transfer log for the first chunk of data and wherein the transfer log is separate from any lists of data from the first chunk that have not yet been transferred to the secondary storage device; and after transferring all of the writes associated with the first chunk of data to the secondary storage device, the primary storage device erasing the transfer log.