公开(公告)号：US20230177069A1

公开(公告)日：2023-06-08

申请号：US17643268

申请日：2021-12-08

Applicant: VMware, Inc.

Inventor： Enning Xiang ,  Wenguang Wang ,  Junlong Gao ,  Hardik Singh Negi ,  Yanxing Pan ,  Pranay Singh ,  Yifan Wang

IPC: G06F16/27 ,  G06F16/22

CPC classification number: G06F16/27 ,  G06F16/2246

Abstract: A method for copy on write (COW) operations generally includes receiving a write request to a first node in an ordered data structure and updating a write ahead log record associated with COW operation with, instead of the content of the first node, a physical disk address of a second node owned by the run point in the ordered data structure that is a parent node of the first node, a pointer to the first node in the second node, a physical disk address of the first node, and a physical disk address of the third node. A metadata table record for a snapshot that owns the first node may be updated with a log sequence number (LSN) of the COW operation. A method for deleting a snapshot includes determining whether the COW operation recorded in the WAL record for the LSN is completed before deleting the snapshot.