The registry performance has also been enhanced and it also includes SMP locking performance. Please refer to the Virtual Server R2 System requirements page here. Only 10 concurrent file-sharing connections are allowed at any moment. Multiple such NAS servers can be clustered to appear as a single device, which allows responsibility for serving clients to be shared in such a way that if one server fails then other servers can take over often termed a failover which also improves fault-tolerance. Monitors and controls disk space usage with directory quotas.