CONTENT-BASED REPLICATION OF DATA BETWEEN STORAGE UNITS

摘要

Methods, systems, and computer programs are presented for replicating data across storage systems. One method includes an operation for transferring a snapshot of a volume from an upstream array to a downstream array. The method further includes an operation for comparing an upstream snapshot checksum of the snapshot in the upstream array with a downstream snapshot checksum of the snapshot in the downstream array. When the upstream snapshot checksum is different from the downstream snapshot checksum, a plurality of chunks in the snapshot are defined. Further, for each chunk in the snapshot, a comparison is made of an upstream chunk checksum calculated by the upstream array with a downstream chunk checksum calculated by the downstream array. When the upstream chunk checksum is different from the downstream chunk checksum then the data of the chunk is sent from the upstream array to the downstream array.

主权项

1. A method for replicating data across storage systems, the method comprising:
transferring a snapshot of a volume from an upstream array to a downstream array, the volume being a single accessible storage area within the upstream array; comparing an upstream snapshot checksum of the snapshot in the upstream array with a downstream snapshot checksum of the snapshot in the downstream array; when the upstream snapshot checksum is different from the downstream snapshot checksum, defining a plurality of chunks in the snapshot; and for each chunk in the snapshot,
comparing an upstream chunk checksum calculated by the upstream array with a downstream chunk checksum calculated by the downstream array; andsending, from the upstream array to the downstream array, data of the chunk when the upstream chunk checksum is different from the downstream chunk checksum.