Human-Centric Composite Quality Modeling and Assessment for Virtual Desktop Clouds

Total Page:16

File Type:pdf, Size:1020Kb

Human-Centric Composite Quality Modeling and Assessment for Virtual Desktop Clouds Human-centric Composite Quality Modeling and Assessment for Virtual Desktop Clouds Yingxiao Xu, Prasad Calyam, David Welling, Saravanan Mohan, Alex Berryman, Rajiv Ramnath University of Missouri, Ohio Supercomputer Center/OARnet, The Ohio State University, USA; Fudan University, China [email protected]; [email protected]; fdwelling, smohan, [email protected]; [email protected] Abstract—There are several motivations (e.g., mobility, cost, security) that are fostering a trend to transition users’ traditional desktops to thin-client based virtual desktop clouds (VDCs). Such a trend has led to a rising importance for human-centric performance modeling and assessment within user communities in industry and academia that are increasingly adopting desktop virtualization. In this paper, we present a novel reference ar- chitecture and its easily-deployable implementation for modeling and assessment of objective user QoE (Quality of Experience) within VDCs, without the need for expensive and time-consuming subjective testing. The architecture novelty is in our approach to integrate finite state machine representations for user workload generation, and slow-motion benchmarking with deep packet inspection of application task performance affected by network health i.e., QoS (Quality of Service) variations to derive a “composite quality” metric model of user QoE. We show how this metric is customizable to a particular user group profile with different application sets, and can be used to: (i) identify domi- nant performance indicators for troubleshooting bottlenecks, and (ii) effectively obtain both ‘absolute’ and ‘relative’ objective user QoE measurements needed for pertinent selection/adaptation of thin-client encoding configurations within VDCs. We validate the effectiveness of our composite quality modeling and assessment Fig. 1. Virtual desktop cloud system methodology using subjective and objective user QoE measure- ments in a real-world VDC featuring RDP/PCoIP thin-client protocols, and actual users for a virtual classroom lab use case Fig. 1 shows the various system components in a VDC. within a federated university system. At the server-side, a hypervisor framework (e.g., ESXi, Xen) I. INTRODUCTION is used to create pools of virtual machines that host user VDs with popular applications (e.g., Excel, Internet Explorer, There are several motivations (e.g., mobility, cost, security) Media Player) as well as advanced applications (e.g., Matlab, that are fostering a trend to transition users’ traditional desk- Moldflow). Users of a common desktop pool use the same tops to thin-client based virtual desktop clouds (VDCs) [1] [2]. set of applications, but maintain their distinctive and personal With the increase in mobile devices with significant computa- datasets. The VDs on the server-side share common physical tion power and connections to high-speed wired/wireless net- hardware and attached storage drives. At the client-side, users works, thin-client technologies for virtual desktop (VD) access connect to a server-side unified resource broker via the Internet are being integrated into mobile devices. In addition, users are using various TCP (e.g., RDP) and UDP (e.g., PCoIP) based increasingly consuming data-intensive content that involve big thin-client devices. The unified resource broker handles all the data (e.g., scientific data analysis) and multimedia streaming connection requests through authentication of users by Active (e.g., IPTV) applications, and thin-clients are needed for these Directory (or other directory service) lookups, and allows applications that require sophisticated server-side computation authorized users to access their entitled VDs with appropriate platforms (e.g., GPUs). Further, using a thin-client may be resource allocation amongst distributed data centers. more cost effective than owning a full-blown PC due to lower To allocate and manage VDC resources for large-scale user device maintenance, and savings through central management workloads of desktop delivery with satisfactory user Quality of desktop support in terms of operating system, application of Experience (QoE), VDC service providers (CSPs) need and security upgrades at the server-side. to suitably provision and adapt the cloud platform CPU, memory and network resources to deliver satisfactory user- This material is based upon work supported by VMware and the perceived ‘interactive response times’ (a.k.a. timeliness) as National Science Foundation under award numbers CNS-1050225 well as ‘streaming multimedia quality’ (a.k.a. coding effi- and CNS-1205658. Any opinions, findings, and conclusions or rec- ommendations expressed in this publication are those of the author(s) ciency). They need to ensure satisfactory user QoE when and do not necessarily reflect the views of VMware or the National user workloads are bursty during “flash crowds” or “boot Science Foundation. storms”, and also when users access VDs from remote sites with varying end-to-end network path performance. For this, As part of the offline benchmarking methodology, we lever- they need tools for VDC capacity planning to avoid system and age finite state machine representations for user workload task network resource overprovisioning. For instance, they need state characterization coupled with slow-motion benchmark- frameworks and tools to benchmark VD application resource ing [4] for deep packet inspection of VD application task requirements so that they can provision adequate resources performance affected by QoS variations. To define VD applica- to meet user QoE expectations (e.g., < 500ms for MS Office tion task states and identify them within network traces during application open time). If excess system and network resources deep packet inspection, we use a concept of ‘marker packets’ are provisioned than the adequate resources, user will not that are instrumented within the traffic between the thin-client perceive the benefit (e.g., user will not perceive the difference and server-side VD ends. We describe how our framework if application open time is 250ms or 500ms). Overprovisioning implementation in the form of a “VDBench benchmarking can become expensive even at the scale of tens of users given engine” is easily-deployable within existing VD hypervsior each VD requires substantial resources (e.g., 1 GHz CPU, 2 environments (e.g., ESXi, Hyper-V, Xen) and can be used GB RAM, 2 Mbps end-to-end network bandwidth). Hence, to instrument a wide-variety of existing Windows and Linux CSPs need frameworks and tools to avoid overprovisioning, platform based thin-clients (e.g., embedded Windows 7, Win- and ultimately derive inherent benefits such as reduced data dows/Linux VNC, Linux Thinstation, Linux Rdesktop) [8] [9] center costs and energy savings. for monitoring VD user QoE through joint performance anal- CSPs also need frameworks and tools to monitor resource ysis of system, network and application context. allocations in an on-going manner so as to detect and trou- By using our novel offline benchmarking methodology bleshoot user QoE bottlenecks. Given the fact that CSPs to within a closed-network testbed, we derive a novel “composite a large extent can control the CPU and memory resource quality” metric model of user QoE and show how it is cus- allocations and right-provision them on the server-side, they tomizable to particular user group profiles with different appli- most critically need the frameworks and tools to detect and cation sets, and can be used to during online monitoring to: (i) troubleshoot network health related issues on the paths over identify dominant performance indicators for troubleshooting the Internet between the thin-client and the server-side VD. bottlenecks amongst numerous factors affecting user QoE in With pertinent network measurement data analysis enabled VD application tasks, and (ii) effectively obtain both absolute through the frameworks and tools, they can perform re- and relative objective user QoE measurements needed for source adaptations that involve selecting appropriate thin-client pertinent selection/adaptation of thin-client encoding configu- protocol configurations that are resilient to network health rations. The absolute objective user QoE measurements allow degradations, and deliver optimum user QoE. comparison of a thin-client protocol’s performance (e.g., RDP) It is important to note that the on-going monitoring should to that of another thin-client protocol (e.g., PCoIP) under a be done without expensive and time-consuming subjective particular QoS condition characterized by latency and packet testing involving actual users of the VDC. From the thin-client loss in the path between the thin-client and the server-side. perspective, remote display protocols are sensitive to network Whereas, the relative objective user QoE measurements allow health i.e., QoS (Quality of Service) variations and consume as comparison of a thin-client protocol’s performance for de- much end-to-end network bandwidth available. They employ graded QoS conditions with reference to ideal QoS conditions different underlying TCP or UDP based protocols that exhibit (e.g., low latency and zero loss). varying levels of user QoE robustness under degraded network We validate the effectiveness of our composite quality conditions [3]. Also, thin-client protocol configuration (and modeling and assessment methodology using subjective and resulting VD application performance) is highly dependent objective user QoE measurements in a real-world VDC fea- on application content
Recommended publications
  • THINC: a Virtual and Remote Display Architecture for Desktop Computing and Mobile Devices
    THINC: A Virtual and Remote Display Architecture for Desktop Computing and Mobile Devices Ricardo A. Baratto Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences COLUMBIA UNIVERSITY 2011 c 2011 Ricardo A. Baratto This work may be used in accordance with Creative Commons, Attribution-NonCommercial-NoDerivs License. For more information about that license, see http://creativecommons.org/licenses/by-nc-nd/3.0/. For other uses, please contact the author. ABSTRACT THINC: A Virtual and Remote Display Architecture for Desktop Computing and Mobile Devices Ricardo A. Baratto THINC is a new virtual and remote display architecture for desktop computing. It has been designed to address the limitations and performance shortcomings of existing remote display technology, and to provide a building block around which novel desktop architectures can be built. THINC is architected around the notion of a virtual display device driver, a software-only component that behaves like a traditional device driver, but instead of managing specific hardware, enables desktop input and output to be intercepted, manipulated, and redirected at will. On top of this architecture, THINC introduces a simple, low-level, device-independent representation of display changes, and a number of novel optimizations and techniques to perform efficient interception and redirection of display output. This dissertation presents the design and implementation of THINC. It also intro- duces a number of novel systems which build upon THINC's architecture to provide new and improved desktop computing services. The contributions of this dissertation are as follows: • A high performance remote display system for LAN and WAN environments.
    [Show full text]
  • Karelia-Ammattikorkeakoulu Työasemien Muuttaminen
    KARELIA-AMMATTIKORKEAKOULU Tietotekniikan koulutusohjelma Jouni Nevalainen TYÖASEMIEN MUUTTAMINEN LINUX-KEVYTPÄÄTTEIKSI OUNEVA GROUPISSA Opinnäytetyö Huhtikuu 2013 OPINNÄYTETYÖ Huhtikuu 2013 Tietotekniikan koulutusohjelma Karjalankatu 3 80200 JOENSUU p. (013) 260 6800 Tekijä Jouni Nevalainen Nimeke Työasemien muuttaminen Linux-kevytpäätteiksi Ouneva Groupissa Toimeksiantaja Ouneva Group Tiivistelmä Työpöytävirtualisointi on oikein toteutettuna tehokas keino säästää tietotekniikan ylläpito- ja laitekustannuksissa. Palvelimilla suoritettavat ohjelmat hyödyntävät laitteistoresursseja tehokkaasti ja työasemina voidaan käyttää iäkkäitäkin tietokoneita. Tässä opinnäytetyössä tutkittiin mahdollisuutta muuttaa tehdasympäristössä Windows XP -työasemat Linux-pohjaisiksi MS Remote Desktop Services -päätteiksi. Muutoksen tuli olla käyttäjille huomaamaton. Tärkeimpänä tavoitteena oli vähentää työasemien ylläpitoon kuluvaa aikaa. Tätä varten päätejärjestelmässä oli oltava mahdollisuus hallita työasemien asetuksia keskitetysti. Eri toteutustapoja arvioitiin näitä vaatimuksia vasten ja rakennettiin vaatimukset täyttävä päätejärjestelmä. Kutakin päätejärjestelmää testattiin ensin virtuaalisesti. Näin pyrittiin löytämään ja ratkaisemaan mahdolliset ongelmat ennen varsinaista koekäyttöä. Tehtaassa tapahtunutta koekäyttöä varten perustettiin tarpeelliset palvelimet ja otettiin päätejärjestelmät käyttöön yhdessä tai useammassa työasemassa. Saatujen kokemusten perusteella arvioitiin järjestelmien käyttökelpoisuutta. Työn lopputuloksena syntyi ohutpääteratkaisu,
    [Show full text]
  • BSD UNIX Toolbox 1000+ Commands for Freebsd, Openbsd
    76034ffirs.qxd:Toolbox 4/2/08 12:50 PM Page iii BSD UNIX® TOOLBOX 1000+ Commands for FreeBSD®, OpenBSD, and NetBSD®Power Users Christopher Negus François Caen 76034ffirs.qxd:Toolbox 4/2/08 12:50 PM Page ii 76034ffirs.qxd:Toolbox 4/2/08 12:50 PM Page i BSD UNIX® TOOLBOX 76034ffirs.qxd:Toolbox 4/2/08 12:50 PM Page ii 76034ffirs.qxd:Toolbox 4/2/08 12:50 PM Page iii BSD UNIX® TOOLBOX 1000+ Commands for FreeBSD®, OpenBSD, and NetBSD®Power Users Christopher Negus François Caen 76034ffirs.qxd:Toolbox 4/2/08 12:50 PM Page iv BSD UNIX® Toolbox: 1000+ Commands for FreeBSD®, OpenBSD, and NetBSD® Power Users Published by Wiley Publishing, Inc. 10475 Crosspoint Boulevard Indianapolis, IN 46256 www.wiley.com Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana Published simultaneously in Canada ISBN: 978-0-470-37603-4 Manufactured in the United States of America 10 9 8 7 6 5 4 3 2 1 Library of Congress Cataloging-in-Publication Data is available from the publisher. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permis- sion should be addressed to the Legal Department, Wiley Publishing, Inc., 10475 Crosspoint Blvd., Indianapolis, IN 46256, (317) 572-3447, fax (317) 572-4355, or online at http://www.wiley.com/go/permissions.
    [Show full text]
  • Credssp Required by Server – Solutions
    CredSSP required by server – Solutions https://www.syskit.com/blog/credssp-required-b... PRODUCTS COMPANY PARTNERS CUSTOMERS SUPPORT Home > Blog > SysKit Monitor > CredSSP required by server – Solutions CredSSP required by server – Solutions Published: May 16, 2017 Published in: SysKit Monitor Author: Silvio Rahle Failed to connect, CredSSP required by server is an error line returned when trying to connect remotely to a Windows machine using RDP version 6 or newer with the Rdesktop client. It represents a frequent problem for Windows and Linux administrators alike. Rdesktop client is UNIX based client software for Microsoft’s Remote Desktop Protocol. It is commonly used on ReactOS and Linux installations to connect to Windows machines running Remote Desktop Services, which often leads to the CredSSP required by server error. Why does it happen? All Windows clients have a credential cache used for authentication against services in a network called NTLM or Windows NT LAN Manager. RDP supports SSO (single sign-on) authentication enabling a user to log in with a single ID and password to gain access to a connected system. However, Linux clients do not support this type of authentication and they require that credentials are provided, either via a Rdesktop command line or via a login window when initiating the remote session. Linux has Kerberos, which is an authentication mechanism for requesting access to 1 of 5 9/26/17, 9:38 PM CredSSP required by server – Solutions https://www.syskit.com/blog/credssp-required-b... PRODUCTS COMPANY PARTNERS CUSTOMERS SUPPORT Granting Ticket), which is used to access other services, such as RDP.
    [Show full text]
  • Courtesy of SAMAG, 11-2005 ( Anton Borisov Тонкий Клиент
    Courtesy of SAMAG, 11-2005 (http://www.samag.ru) Anton Borisov Тонкий клиент - шаг к “мэйнфреймам”? Когда-то терминалы подключались к мощным серверам и обработка информации происходила на мэйнфреймах. Затем появились достаточно мощные ПЭВМ и информация стала обрабатываться на рабочих местах. Похоже история любит повторяться, но сегодня уже в зеркальном отражении - становится опять экономически выгодно использовать “мэйнфреймы” с подключением легких терминалов - тонких клиентов. Как показывает практика, чем сложнее становится система, тем больше усилий требуется на поддержание ее в рабочем состоянии. В то же время, становится очевидной специализация тех или иных бизнес-процессов. Можно уже четко определить, какие конкретно ресурсы требуются определенным пользователям для решения их бизнес-задач. Исходя из указанных предпосылок данным пользователям следует выделить необходимый конкретно им инструментарий, но не более того. Кроме этого, установку (а в дальнейшем и обновление) пакетов прикладных программ, хранение электронной документации также рациональнее вести в одином месте – на производительном терминальном сервере. Таким образом, проведя анализ потоков данных и выяснив структуру документооборота, предприятие может попробовать преобразовать структуру рабочих мест. Из названия следует, что ориентир сделан на создание тонких клиентов, т.е. создание ПЭВМ, которые отображают выполнение програмного обеспечения на серверной стороне, при этом, будучи клиентской частью, могут быть совершенно облегченными. Под облегченностью понимается как использование
    [Show full text]
  • Download Article
    Advances in Computer Science Research (ACRS), volume 54 International Conference on Computer Networks and Communication Technology (CNCT2016) Research and Implementation of RDP Proxy Proxy-based Audit System 1 2, 3 Xiao-Liang ZHANG , Xiao-Yu WU and Wu-Xia ZHANG 1,2,3 School of Computer Science and Technology North China Electric Power University Beijing, China [email protected] Keywords: RDP protocol, The agency agreement, The audit system, The operation playback, Security. Abstract. Using the Windows RDP protocol developed by Microsoft Inc to connect and operate the remote machines which base on the same system become a trend. However, the RDP has caused many security problems. It is necessary to design and implement a audit system to ensure the system’s security and guarantee the machines run correctly. It points out improper methods than before and accomplishes the RDP proxy proxy-based audit system to solve the problems. Introduction The expansion of Business Scale have a influence on the working place and implementation in the different workplaces. The operator operate the remote servers in accordance with RDP protocol. RDP provides a graphical interface to help the maintain staffs interact with the remote server system. In comparison to the former, the operations become easier and the efficiency of workers' operation become better[1]. Using the remote desktop client we can connect any server that support the remote control and can decrease the workload. Remote desktop procedure just convey the information of the user’s mouse, keyboard and other device to the remote server system and never involved in the data processing, so that the level of hardware requirements commonly.
    [Show full text]
  • Anàlisis D'implantació I Gestió D'un Telecentre Emprant
    PROJECTE FI DE CARRERA ANÀLISIS D’IMPLANTACIÓ I GESTIÓ D’UN TELECENTRE EMPRANT CLIENTS LLEUGERS AUTOR: TUTOR: FRANCESC PINEDA SEGARRA ENRIC GUITART BARAUT Resum En aquest projecte es realitza un estudi per a la implantació d’un telecentre i la seva gestió util- itzant equips a mode de clients lleugers amb estructura client-servidor. S’analitzen les alternatives disponibles de software lliure que permeten disposar d’eines prou madures per aconseguir una bona experiència d’usuari i optimitzar-ne el seu manteniment a l’administrador. I Índex Índex de Figures V Índex de Taules VIII 1 Introducció 1 1.1 Objectius . 1 1.2 Estructuració . 2 2 Anàlisis 3 2.1 Tipus d’equips . 3 2.1.1 Equips amb hardware pesat . 4 2.1.2 Equips amb hardware lleuger . 5 2.1.3 Avantatges e inconvenients . 7 2.1.4 Conclusions dels tipus de clients . 11 2.2 Software disponible per a infraestructures client-servidor . 12 2.2.1 2X ThinClientServer Enterprise Edition . 12 2.2.2 Thinstation . 12 2.2.3 OpenThinClient . 12 2.2.4 LTSP . 13 2.2.5 TCOS . 15 2.3 Passarel·la a software propietari . 16 2.4 Serveis bàsics . 16 2.4.1 Requisits per als equips clients . 16 2.4.2 Requisits per a l’equip servidor . 17 2.5 Serveis complementaris . 18 2.5.1 Eines de supervisió i gestió . 18 2.6 Estructura de la xarxa . 22 2.6.1 Xarxa amb serveis centralitzats . 22 III 2.6.2 Xarxa amb firewall independent . 23 2.6.3 Xarxa amb servidors virtualitzats .
    [Show full text]
  • Remote Desktop Protocol Free
    Remote Desktop Protocol Free Rene remains additional after Gordan fustigates medially or alien any mermaids. Timmy furnaced frothily? Four-footed Neddie still duffs: rusted and benevolent Hansel glad quite hundredfold but emends her seers flatwise. While the pros of using remote desktop include increased security and eliminating bandwidth issues, it is widely used in the corporates due to the reason that it provides easy accessibility to a computer, or user friendly IMO. Determine how much padding is needed for the nav. There are a plethora of remote software tools in the market and selecting one for your project could be a challenge. Lorem ipsum dolor sit amet consectetur, Firefox or Chrome. What is Bitcoin mining and how can you do it? How does one wipe clean and oil the chain? It focuses on company culture, secure remote access, popularity and what is the impact of it on the organizations using it. Newer versions of RDP are far more secure. Or do the opposite. It provides the same user experience as a local application! It provides functionalities to remotely support customers, we can help set you up with Windows RDP tailored to your needs. Team Viewer is a famous software in Remote Software Innovation industry. URL for your CSS file. Why is Zoho Assist the best alternative to RDP? Remote desktop protocol RDP is any network communications protocol that allows remote management of assets. Which one should be used? PC in order to access it. By using our website, and mobile app. Unfortunately, importing from ADC, you can use a Terminal Server with a web Client.
    [Show full text]
  • Cuenca López, Diana Maribel, Jaramillo Veintimilla, Marilyn Del
    Universidad Nacional de Loja | II UNIVERSIDAD NACIONAL DE LOJA ÁREA DE LA ENERGÍA, LAS INDUSTRIAS Y LOS RECURSOS NATURALES NO RENOVABLES INGENIERÍA EN SISTEMAS TEMA: “DISEÑO E IMPLEMENTACIÓN DE LABORATORIOS DE COMPUTACIÓN ESCOLARES MEDIANTE EL USO DE COMPUTADORAS RECICLADAS Y SOFTWARE LIBRE EDUCATIVO PARA LOS ALUMNOS DEL JARDÍN DE INFANTES “JOSÉ ALEJO PALACIOS” Y LA ESCUELA “PEDRO VICTOR FALCONÍ” ANEXOS A LA UNIVERSIDAD NACIONAL DE LOJA” Tesis previa a la obtención del Título de Ingeniero en Sistemas Autores: Diana Maribel Cuenca López Marilyn del Cisne Jaramillo Veintimilla Director: Ing. Milton Leonardo Labanda Jaramillo Loja-Ecuador Universidad Nacional de Loja | III CERTIFICACIÓN Ing. Milton Leonardo Labanda Jaramillo. DOCENTE DE LA CARRERA DE INGENIERIA EN SISTEMAS DE LA UNIVERSIDAD NACIONAL DE LOJA Y DIRECTOR DE TESIS. CERTIFICA Que el trabajo de investigación, con el tema: “DISEÑO E IMPLEMENTACIÓN DE LABORATORIOS DE COMPUTACIÓN ESCOLARES MEDIANTE EL USO DE COMPUTADORAS RECICLADAS Y SOFTWARE LIBRE EDUCATIVO PARA LOS ALUMNOS DEL JARDÍN DE INFANTES “JOSÉ ALEJO PALACIOS” Y LA ESCUELA “PEDRO VICTOR FALCONÍ” ANEXOS A LA UNIVERSIDAD NACIONAL DE LOJA”, de la autoría de los señoritas DIANA MARIBEL CUENCA LÓPEZ y MARILYN DEL CISNE JARAMILLO VEINTIMILLA, ha sido revisado en su totalidad por lo que cumple con los requisitos reglamentarios, autorizándose su presentación y defensa correspondiente para los fines pertinentes. Loja, 10 de febrero de 2012. Ing. Milton Leonardo Labanda Jaramillo DIRECTOR DE TESIS Universidad Nacional de Loja | IV Autoría Todas las ideas, conceptos, conclusiones y recomendaciones expuestos en el presente trabajo han sido resultado de una ardua labor investigativa, por lo tanto es de exclusiva responsabilidad de sus autores.
    [Show full text]
  • Traditional LAN Booting / Openslx Project DAAD Summer School: Aspects of Large Scale High Speed Computing 21St March 2011
    Traditional LAN Booting / OpenSLX Project DAAD Summer School: Aspects of Large Scale High Speed Computing 21st March 2011 Dr. Dirk von Suchodoletz, Sebastian Schmelzer, Michael Janczyk Faculty of Engineering, University Freiburg Last Lecture • Introduction / Motivation, why virtualize? • Administrative and economic advantages • History and main ideas • Distinguish full, hardware assisted, para virtualization and tools using it, partitioning, emulation • Practical application: Running Windows without pain in flexible lecture pools • Classic server consolidation: Experiences and further usage scenarios • Virtualization for preservation of complex digital objects 03/23/11 2 Overview of this Lecture • Introduction • Different Concepts of Operation • Project Idea OpenSLX • Getting started – Tools to use for basic and advanced setups • ... 03/23/11 3 Structure: LAN Booting Linux Different Concepts of Operation Project Idea OpenSLX 03/23/11 4 Traditional LAN Boot Booting machines via PXE over Ethernet LAN connections − DHCP to provide basic IP setup − Next-Server and filename statements to provide information to load next stage bootloader via the net − Different variants possible – PXE/SysLinux the most common combination Boot conceptually does not differ much from traditional kernel and InitRamFS load of a modern Linux system − InitRamFS loads all necessary components to enable rootfilesystem the system later runs off − Easiest setup: Root filesystem via NFS, later experiments could use NBD/SquashFS 5 The OpenSLX Project To generalize the
    [Show full text]
  • „Entwicklung Einer Netzwerkboot-Umgebung Für Thin-Clients“
    Diplomarbeit „Entwicklung einer Netzwerkboot-Umgebung für Thin-Clients“ Ausgeführt zum Zweck der Erlangung des akademischen Grades eines Dipl.-Ing. (FH) für Telekommunikation und Medien am Fachhochschul-Diplomstudiengang Telekommunikation und Medien St. Pölten Vertiefungsrichtung Telekommunikation unter der Leitung von Bakk.rer.soc.oec. Bernhard R. Fischer ausgeführt von Hans-Peter Brandstätter tm0210038017 St. Pölten, am 08. September 2006 Unterschrift: Ehrenwörtliche Erklärung II Ehrenwörtliche Erklärung Ich versichere, dass - ich diese Diplomarbeit selbständig verfasst, andere als die angegebenen Quellen und Hilfsmittel nicht benutzt und mich auch sonst keiner unerlaubten Hilfe bedient habe. - ich dieses Diplomarbeitsthema bisher weder im Inland noch im Ausland einem Be- gutachter/in zur Beurteilung oder in irgendeiner Form als Prüfungsarbeit vorgelegt habe. Diese Arbeit stimmt mit der vom Begutachter beurteilten Arbeit überein. Ort, Datum Unterschrift Kurzfassung III Kurzfassung Durch die ständig steigende Komplexität von dezentral verwalteten Computernetzen, besonderes in Mittel- und Großbetrieben, steigt auch die damit verbunden Fehleranfäl- ligkeit solcher Systeme. Aber nicht nur durch den erhöhten Administrationsaufwand, der meist recht autonomen Computerarbeitsplätze, nehmen jährlich die Kosten der IT- Abteilungen zu, sondern auch durch die stetig wachsenden Anforderungen an die Leis- tungsfähigkeit der Arbeitsplatzrechner und die damit einhergehenden kürzeren Aus- tauschzyklen dieser Computer. Alternativ zu den dezentralen Computernetzen,
    [Show full text]
  • Devon IT Terminal Operating System (Detos) Dell Edition Administration Manual
    Devon IT Terminal Operating System (DeTOS) Dell Edition Administration Manual Notes, Cautions, and Warnings NOTE: A NOTE indicates important information that helps you make better use of your computer. CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. ______________ Information in this publication is subject to change without notice. © 2012 Dell Inc. All rights reserved. Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell™, the DELL logo, and OptiPlex™ are trademarks of Dell Inc. Devon IT, the Devon IT logo, Devon IT Echo™ Thin Client Management Software, Devon Zero™, and VDI Blaster™ are registered trademarks of Devon IT Inc. in the U.S. and other countries. Microsoft®, Windows®, Windows Server®, MS-DOS® and Windows Vista® are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries. Citrix®, Xen®, XenServer®, XenDesktop™, ICA™, and XenMotion® are either registered trademarks or trademarks of Citrix Systems, Inc. in the United States and/or other countries. VMware®, VMware View™, View Client ™,Virtual SMP®, vMotion®, vCenter®, and vSphere® are registered trademarks or trademarks of VMware, Inc. in the United States or other countries. Other trademarks and trade names may be used in this publication to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own. 2012 - 01 Rev.
    [Show full text]