DISTRIBUTED FILE SYSTEM AND DATA BACKUP METHOD FOR DISTRIBUTED FILE SYSTEM.

摘要

Disclosed are a distributed file system and a data backup system for the distributed file system. The system comprises: a main FLR, a first FAC, a main FAS, and a first dormant FLR and a first alternate FAS; a backup distributed subsystem comprises a backup FLR, a second FAC, a backup FAS, and a second dormant FLR and a second alternate FAS; the first dormant FLR and the second dormant FLR are both used to back up the metadata on the FLR or on the backup FLR; the first alternate FAS and the second alternate FAS are both used to synchronize with the main FAS and the backup FAS and to perform write operations on current real data when the first FAC or the second FAC receives data write operation commands. The present invention enhances the reliability and practicality of the system.