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Write amplification is a critical factor limiting the random write performance and write endurance in storage devices based on NAND-flash memories such as solid-state drives (SSD). The impact of garbage collection on write amplification is influenced by the level of over-provisioning and the choice of reclaiming policy. In this paper, we present a novel(More)
— Interest in distributed storage is fueled by demand for reliability and resilience combined with ubiquitous availability. Peer-to-peer (P2P) storage networks are known for their decentralized control, self-organization, and adaptation. Advanced searching for documents and resources remains an open problem. The flooding approach favored by some P2P(More)
Storage systems are increasingly subject to attacks. Cryptographic file systems mitigate the danger of exposing data by using encryption and integrity protection methods and guarantee end-to-end security for their clients. This paper describes a generic design for cryptographic file systems and its realization in a distributed storage-area network (SAN)(More)
A filesystem-level storage cloud offers network-filesystem access to multiple customers at low cost over the Internet. In this paper, we investigate two alternative architectures for achieving multi-tenancy securely and efficiently in such storage cloud services. They isolate customers in virtual machines at the hypervisor level and through mandatory(More)
— Today's known and widely used active queue management (AQM) schemes do not differentiate between packets from responsive (e.g., TCP sessions) and non-responsive traffic (e.g., UDP). This results in further widening the gap of unfair advantage already inherent to non-responsive traffic, as the responsive sender will significantly reduce its future transmit(More)
Network processors (NPs) implement a balance between hardware and software that addresses the demand of performance and pro-grammability in active networks (AN). We argue that this makes them an important player in the implementation and deployment of ANs. Besides a general introduction into the relationship of NPs and ANs, we describe the power of this(More)
Fast non-volatile memories are exposing inefficiencies in traditional I/O stacks. Though there have been fragmented efforts to deal with the issues, there is a pressing need for a high-performance storage stack. Interestingly, 20 years ago, networks were faced with similar challenges , which led to the development of concepts and implementations of multiple(More)
Network processors have been developed to ease the implementation of new network protocols in high-speed routers. Being embedded in network interface cards, they enable extended packet processing at link speed as is required, for instance, for active network nodes. Active network nodes start using network processors for extended packet processing close to(More)
— Active Queue Management (AQM) tries to find a delicate balance between two antagonistic Internet queuing requirements: First, buffer space should be maximized to accommodate the possibly huge transient bursts; second, buffer occupation should be minimum so as not to introduce unnecessary end-to-end delays. Traditional AQM mechanisms have been built on(More)