公开(公告)号：US11455255B1

公开(公告)日：2022-09-27

申请号：US17328281

申请日：2021-05-24

Applicant: VMware, Inc.

Inventor： Abhay Kumar Jain ,  Sriram Patil ,  Wenguang Wang ,  Enning Xiang ,  Asit A. Desai

IPC: G06F12/00 ,  G06F12/10 ,  G06F16/17 ,  G06F16/11

Abstract: Techniques for improving the read performance of an LFS-based storage system that supports COW snapshotting are provided. In one set of embodiments, the storage system can implement an intermediate map for each storage object in the system that is keyed by a composite key consisting of snapshot identifier (major key) and LBA (minor key). With this approach, contiguous logical block addresses (LBAs) of a storage object or its snapshots will map to contiguous -to-PBA mappings in the storage object's intermediate map, resulting in good spatial locality for those LBAs and robust read performance.