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Infrastructure as a Service (IaaS) is one of the fundamental service models of Cloud Computing. It usually provides computing resources through virtualization. Hardware virtualization is the most used virtualization technology, but new ones arise as paravirtualization, Operating System (OS) level virtualization and Containers.This article discusses about the filesystem of a new proposed virtualization technology for Cloud Computing: a Distributed Resource Virtualization System (DRVS) in which computing, networking and storage resources of each virtual execution environment are scattered in the nodes of a cluster. DRVS is based on Virtual Operating Systems (VOS) which provides abstractions and services to applications, but it does not handle real hardware; it uses virtualized devices provided by an underlying software layer such as a real OS. Although there are several filesystems and storage technologies that provide these services, they must meet isolation features required by distributed virtualization. Furthermore, it requires location transparency regardless of whether they run within the same node or in different nodes of the cluster, and it is often required replication and migration supportto improve service availability.