Fairness in a data center

Existing data centers utilize several networking technologies in order to handle the performance requirements of different workloads. Maintaining diverse networking technologies increases complexity and is not cost effective. This results in the current trend to converge all traffic into a single networking fabric. Ethernet is both cost-effective and ubiquitous, and as such it has been chosen as the technology of choice for the converged fabric. However, traditional Ethernet does not satisfy the needs of all traffic workloads, for the most part, due to its lossy nature and, therefore, has to be enhanced to allow for full convergence. The resulting technology, Data Center Bridging (DCB), is a new set of standards defined by the IEEE to make Ethernet lossless even in the presence of congestion. As with any new networking technology, it is critical to analyze how the different protocols within DCB interact with each other as well as how each protocol interacts with existing technologies in other layers of the protocol stack. This dissertation presents two novel schemes that address critical issues in DCB networks: fairness with respect to packet lengths and fairness with respect to flow control and bandwidth utilization. The Deficit Round Robin with Adaptive Weight Control (DRR-AWC) algorithm actively monitors the incoming streams and adjusts the scheduling weights of the outbound port. The algorithm was implemented on a real DCB switch and shown to increase fairness for traffic consisting of mixed-length packets. Targeted Priority-based Flow Control (TPFC) provides a hop-by-hop flow control mechanism that restricts the flow of aggressor streams while allowing victim streams to continue unimpeded. Two variants of the targeting mechanism within TPFC are presented and their performance evaluated through simulation

Study of TCP Issues over Wireless and Implementation of iSCSI over Wireless for Storage Area Networks

The Transmission Control Protocol (TCP) has proved to be proficient in classical wired networks, presenting an ability to acclimatize to modern, high-speed networks and present new scenarios for which it was not formerly designed. Wireless access to the Internet requires that information reliability be reserved while data is transmitted over the radio channel. Automatic repeat request (ARQ) schemes and TCP techniques are often used for error-control at the link layer and at the transport layer, respectively. TCP/IP is becoming a communication standard [1]. Initially it was designed to present reliable transmission over IP protocol operating principally in wired networks. Wireless networks are becoming more ubiquitous and we have witnessed an exceptional growth in heterogeneous networks. This report considers the problem of supporting TCP, the Internet data transport protocol, over a lossy wireless link whose features vary over time. Experimental results from a wireless test bed in a research laboratory are reported

Performance analysis and design of iSCSI over wireless network

Master'sMASTER OF ENGINEERIN

Hyperscsi : Design and development of a new protocol for storage networking

Ph.DDOCTOR OF PHILOSOPH

Enterprise Network Design and Implementation for Airports

The aim of this project was airports network design and implementation and the introduction of a suitable network for most airports around the world. The following project focused on three main parts: security, quality, and safety. The project has been provided with different utilities to introduce a network with a high security level for the airport. These utilities are hardware firewalls, an IP access control list, Mac address port security, a domain server and s proxy server. All of these utilities have been configured to provide a secure environment for the entire network and to prevent hackers from entering sensitive departments like the flight management and service providers departments. Improving the performance of any network requires a high quality of techniques and services which help to improve the general task of the network. The technical services that have been placed in the airport’s network are failover firewalls utility, a Pre-boot Execution Environment (PXE) server, a Dynamic Host Configuration Protocol (DHCP) server, a Domain Name System (DNS) server and a cabling system. These tools can increase the performance of the network in general and provide a stable internet service for the Air Traffic Control System by using dual internet service providers and the failover utility. The dual internet service providers’ role was to provide the flight management department, which helps to confirm the backup operation for the Air Traffic Control Complex (BATCX) system to outside the local network. This is achieved by using Windows servers backup (iSCSI initiators and iSCSI target) servers which helps to keep the Air Traffic Control systems’ information in a safe place. Also, for passengers’ personal information safety, the web server has been placed in the local network, which provides a secure environment for any network’s element

The design of a storage architecture for mobile heterogeneous devices.

Mobile computing devices such as smart PDAs and ultra-light laptops with several networking interfaces are becoming commonplace. The provision of networked data storage facilities will greatly extend their use. This paper looks at the design of a storage architecture for such devices. A two-level structure is proposed in which one component, the mobile memory cache (MMC), moves when the node is mobile. A prototype MMC was designed and evaluated. Preliminary results are presented which show that the system should be able to provide a high performance service

Fiber Channel Vs. Internet Scsi On Storage Area Networks For Disaster Recovery Operations

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2006Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2006Bu tez çalışmasında iSCSI tabanlı veri depolama ağlarının performansının iyileştirilmesi için iSCSI ve TCP katmalarının birbiriyle etkileşimi incelenmektedir. Bu inceleme neticesinde en uygun iSCSI ve TCP parametre değerleri belirlenmeye çalışılmıştır. Uygun parametre değerleri kullanılarak optimize edilmiş bir iSCSI veri depolama çözümünün Fiber Kanal tabanlı veri depolama çözümlerine alternatif olabileceği gösterilmeye çalışılmıştır.This thesis examines the interactions between the iSCSI and TCP layer in order to improve the performance of iSCSI-based storage system. As a result of this study, the most proper iSCSI and TCP parameter values were supposed to be determined. By using these proper parameter values, it was tried to be shown that an optimized iSCSI-based storage solution with suitable parameters can be an alternative to FC-based storage solutions.Yüksek LisansM.Sc

STCP: A New Transport Protocol for High-Speed Networks

Transmission Control Protocol (TCP) is the dominant transport protocol today and likely to be adopted in future high‐speed and optical networks. A number of literature works have been done to modify or tune the Additive Increase Multiplicative Decrease (AIMD) principle in TCP to enhance the network performance. In this work, to efficiently take advantage of the available high bandwidth from the high‐speed and optical infrastructures, we propose a Stratified TCP (STCP) employing parallel virtual transmission layers in high‐speed networks. In this technique, the AIMD principle of TCP is modified to make more aggressive and efficient probing of the available link bandwidth, which in turn increases the performance. Simulation results show that STCP offers a considerable improvement in performance when compared with other TCP variants such as the conventional TCP protocol and Layered TCP (LTCP)

{SoK}: {An} Analysis of Protocol Design: Avoiding Traps for Implementation and Deployment

Today's Internet utilizes a multitude of different protocols. While some of these protocols were first implemented and used and later documented, other were first specified and then implemented. Regardless of how protocols came to be, their definitions can contain traps that lead to insecure implementations or deployments. A classical example is insufficiently strict authentication requirements in a protocol specification. The resulting Misconfigurations, i.e., not enabling strong authentication, are common root causes for Internet security incidents. Indeed, Internet protocols have been commonly designed without security in mind which leads to a multitude of misconfiguration traps. While this is slowly changing, to strict security considerations can have a similarly bad effect. Due to complex implementations and insufficient documentation, security features may remain unused, leaving deployments vulnerable. In this paper we provide a systematization of the security traps found in common Internet protocols. By separating protocols in four classes we identify major factors that lead to common security traps. These insights together with observations about end-user centric usability and security by default are then used to derive recommendations for improving existing and designing new protocols---without such security sensitive traps for operators, implementors and users

Benchmarking of IP-based Network Storage Systems

Mobile platforms with access to high speed wireless network have become ubiquitous. Advancements in network technology and consumer electronics have brought traditional storage systems into offices and homes. Services based on cloud technologies, including object based storage, have gained popularity among both private users and enterprises. However, there is still a lack of systematic evaluation of both traditional storage systems and cloud based object storage in a mobile and wireless context. In this thesis, we evaluate the performance of three drastically different storage systems, namely NFS, iSCSI, and OpenStack Swift, which can potentially be used by mobile platforms over wireless network. We build a testbed and an in house, ad hoc microbenchmark to study the impact of various network complexities and different access behaviours of application. In addition, we employ two widely used macrobenchmarks -- PostMark and FileBench -- to simulate the workloads of typical applications. We find that: (1) iSCSI excels in networks whose condition is as good as LAN; (2) NFS and Swift are more suitable for complex networks such as wireless network and WAN; (3) Swift is a viable replacement for NFS in all scenarios; and (4) System configuration on the client side impacts storage performance significantly and deserve adequate attention. Furthermore, we make several recommendations to practitioners and point out numerous future research directions