SYSTEM AND METHOD OF RESYNCING N-WAY MIRRORED METADATA ON DISTRIBUTED STORAGE SYSTEMS WITHOUT REQUIRING CHECKSUM IN THE UNDERLYING STORAGE

摘要

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for resynchronizing data in a storage system. One of the methods includes receiving, by a first storage subsystem, a plurality of write requests corresponding to respective meta data blocks, wherein the first storage subsystem comprises a meta object; storing, by the first storage subsystem and for each write request, in each disk of the meta object, a version of the corresponding meta data block; determining that a particular disk of the meta object has failed; determining whether one or more valid versions of the meta data block are stored in respective other disks of the meta object; and in response to determining that one or more valid versions of the meta data block are stored in respective other disks of the meta object, resynchronizing the meta data block in the particular disk.