  Our goal in this paper is to investigate the fluid picture associated with an
open large scale storage network of non-reliable file servers with finite
capacity. In this storage system, new files can be added and a file with only
one copy can be lost or duplicated. The Skorokhod problem with oblique
reflection in a bounded convex domain is used to identify the fluid limits.
Such analysis involves the study of three different regimes, the under-loaded,
the critical and the overloaded regime. The overloaded regime is of particular
importance. To identify the fluid limits, new martingales are obtained and an
averaging property is established.
