Patent ID: 8639731

Claim:
An apparatus comprising: a first storage; a file server, coupled to the first storage, and comprising a second storage, and being operable to manage a plurality of root nodes for an object of a file system, and being operable to manage an update for data of a first portion of the plurality of root nodes in a status in which (i) data of a second portion of the plurality of root nodes is written from the second storage of the file server to the first storage and (ii) a new checkpoint, capable of being used when a version of the object of the file system is recovered, is taken; and the file server being further operable to manage an update for the object of the file system in another status in which (iii) data of the first portion of the plurality of root nodes is written from the second storage of the file server to the first storage and (iv) a next new checkpoint is taken.