The invention discloses a glusterfs (Gluster File System)-based method for expansion in an erasure group. The method comprises the following steps: correcting a glusterfs management code, adding a volume internal erasure relation index in a glusterfs management system, and allowing different types of erasures to exist in a volume; allowing a storage medium to be managed by a plurality of progresses; when the storage medium is mounted after being formatted, establishing a plurality of subcatalogs in a mounting point, and forming an erasure by the subcatalogs. The own architecture limitation of a gluster is broken through, and the different types of erasures are allowed to exist in the same volume; a relation that multiple glusterfsd progresses correspond to one storage medium is realized, and the original relation that one glusterfs progress corresponds to one storage medium is broken through, so that the architecture is more flexible. A function of the glusterfs is fully used for realizing expansion of the erasure; the change for an original code is relatively small and is easier to realize.