Patent ID: 9383937
Filing Date: 2016-07-05
CPC Classification: G06F

Claim Text:
1. A method comprising: checking periodically, using a processor, for a value associated with data in a data block in a higher tier journal stored on a first storage array having deduplication-based functionality, the higher tier journal comprising: copying the data in the data block from the higher tier journal to a lower tier journal in a second storage array in response to a determination that the data in the data block exists only in the UNDO stream in the higher tier journal, the first storage array and the second storage array being used in a continuous data protection system to replicate a volume; replacing the data in the data block in the higher tier journal with a zero block in response to a determination that the data in the data block exists only in the UNDO stream; and marking a block in metadata in the UNDO METADATA stream, corresponding to the data block and pointing to the offset in the UNDO stream of the higher tier journal, to point to an offset of an UNDO stream in the lower tier journal.