TRACKING WRITES AND SNAPSHOT CREATION/DELETION IN MEMORY TO IMPROVE ASYNCHRONOUS REPLICATION PERFORMANCE AND SUPPORT LOWER RECOVERY POINT OBJECTIVES (RPOS)

Abstract: techniques for tracking incoming writes and snap creation/deletion in memory to improve asynchronous replication and support lower rpos. in the techniques, a storage system uses its data cache to receive data specified in write requests issued by storage clients, while dedicating an amount of the cache memory to track and record offsets/lengths of writes directed to source volumes. at the end of each replication interval, the storage system obtains a list of the recorded offsets/lengths for each source volume, identifies and reads areas of the source volume that were written to during the replication interval using the list, and replicates data from the identified areas to a destination volume. because the list of recorded offsets/lengths of incoming writes for the source volume is compiled and available from volatile cache memory, it can be generated and accessed very quickly using reduced processing/memory resources, allowing for lower rpos in asynchronous replication processes.

Inventor(s): David Bernard, Mayank Ajmera, Vamsi K. Vankamamidi, Vikram Prabhakar

CPC Classification: G06F11/1451 ({by selection of backup contents})

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