METHODS FOR SNAPSHOT MANAGEMENT AND DIFFERENCE BITMAP GENERATION IN DISTRIBUTED STORAGE SYSTEM, AND PRODUCT

Disclosed in embodiments of the present invention are methods for snapshot management and difference bitmap generation in a distributed storage system, and a product. The distributed storage system comprises N storage nodes. The N storage nodes are used for providing a storage space for a first logical unit number (LUN). The method for snapshot management comprises: a storage node Ni generates a first record; the first record is only used for recording an update address corresponding to a logical address of the first LUN distributed at the storage node Ni at a first snapshot moment; the logical address of the first LUN distributed at the storage node Ni and a logical address of a second LUN distributed at the storage node Ni belong to a same partition; the storage node Ni generates a second record; the second record is only used for recording the update address corresponding to the logical address of the first LUN distributed at the storage node Ni at the second snapshot moment; the first snapshot moment and