Dell Products Inc.

Anitta Jose

Alan Lee Taylor

Nagapraveen Veeravenkata Seela

Techniques for optimizing a remote data copy using multiple storage nodes. The techniques include receiving a copy command for a volume at a first node, a first subset of VOL slices being owned by the first node, and a second subset of VOL slices being owned by a second node. The techniques include obtaining, by the first node, respective diff bitmaps for the first subset of slices and the second subset of slices. The techniques include sending the diff bitmap for the second subset of slices to the second node. The techniques include performing, by the first node, a first copy operation based on the diff bitmap for the first subset of slices, and performing, by the second node, a second copy operation based on the diff bitmap for the second subset of slices, the second copy operation being performed at least partially in parallel with the first copy operation.

Method for optimizing a remote data copy using multiple nodes

Selective replication of data in a data storage system includes tracking write transactions using tracking entries in a tracking structure. The tracking structure is periodically processed to create a reporting structure containing reporting entries each identifying a respective extent modified by one or more of the write transactions. The processing for each tracking entry includes (1) examining the reporting structure to determine whether the tracking entry expands an extent of a reporting entry, (2) based on the tracking entry not expanding an extent a reporting entry, creating a new reporting entry based on the tracking entry, and (3) based on the tracking entry expanding an extent of a reporting entry, modifying the reporting entry to identify the extent as so expanded. The reporting structure is used to perform a replication copy operation of the extents identified therein.

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Portland, OR, United States of America

Anitta Jose