Patent ID: 11914866
Assignee: EMC IP HOLDING COMPANY LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method, comprising:
receiving a write at a filter operating between a device and a volume;
marking an entry in a primary map based on an address of the write, the primary map including a plurality of entries, each entry corresponding to an extent of the volume, wherein the extent has a fixed size;
receiving a request to perform a delta operation, wherein writes subsequent to the request are marked in a secondary map and the primary map is frozen;
processing the primary map to transfer data associated with the marked entries to a consumer;
receiving a new write while processing the primary map;
performing bit logic that determines how the new write is handled in the volume, the primary map, and the secondary map; and
setting the secondary map to be the primary map and setting the primary map to be the secondary map when all of the entries in the primary map are clean.