Non-Limitations

fakefs should be LFS-compliant. It may be asked to store more than $2^{31}$ bytes of data.

Note that Berkeley DB will not be used to store objects larger than $2^{31}$, probably nothing much larger than $2^{20}$. After this point, Berkeley DB becomes no more space-efficient than the underlying filesystem, and accessing data items begins to involve RAM-hungry large memory copies.