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Stuttgart, Univ., Fachstudie, 2006.

Virtual servers are being increasingly utilized in higher education forclient computers, this thesis investigates if virtualization could also bebeneficial for servers. By providing three general models (the first beingthe current situation and the two latter leveraging virtualization) andevaluating each, a broad sense of the applicability, possibilities andremaining problems of introducing server virtualization is provided.For one specific course, TDDD27 - Advanced web programming, amore concrete analysis is done and specific recommendations are pro-vided.The conclusion is that there are still more work to be done, butboth of the proposed models are possible and suitable for some courses.Their introduction should have several positive effects, for instancefairer courses and more focus on the subject at hand.

Magistro darbe apžvelgiamos virtualizavimo programos. Nustatomi jų trūkumai ir privalumai kuriant virtualizavimo infrastruktūra įmonės IT skyriui. Parenkamas tinkamiausias virtualizavimo būdas IT skyriui. / Due to the flexibility of virtualization there is a good chance that there is a virtual design or system to meet the most demanding needs and because of this virtualization is merely duplicating the revolution in open systems by supplying a wide variety of solutions and meet any IT needs.

The goal of the thesis is to examine and assess actual portfolio of products on the market for server visualization and to compare performance of individual products with performance of the physical machine. The research and the assessment of the actual portfolio will be carried out with the focus on current trends in the area of server virtualization, reasons for realization, and important aspects for their successful implementation. The comparison will be carried out in areas of supported platforms, hardware emulation spectra, hardware limitations, licensing and prices. Further it will be performed comparison in the form of benchmark performance in areas of CPU, RAM, hard-drive throughput, and network throughput of most commonly used products for server virtualization.

Master thesis deals with the problematics of webpages hosting in the Czech Republic. The goal of the thesis is to design a procedure and to implement an application for automated determination of whether a particular website is operated on a third party server or an own server of the organization or the individual. The thesis is divided into two main parts. The first part of the thesis lays a theoretical base concerning principals, protocols and services which are necessary for providing availability of the webpages with special attention to the specifics of the Czech internet environment. In the practical part there are several approaches to the analysis of the obtained data proposed. On that basis there is designed and in the form of the detection application implemented an algorithm which goal is to determine whether the submitted webpages are placed on a shared server and to collect the information about their hosting. In the last part of the thesis the application runs based on the created database of webservers organized by the categories of the webserver operators. In this analytic part the obtained output information about these webservers hosting are processed and presented together with the relevant context concerning the hosting of these webpages in the Czech Republic.

Denna rapport behandlar en undersökning av olika lastbalanseringsalgoritmer i Linux Virtual Server. Undersökningen har gjorts i ett webbkluster (Apache var webbservern som användes) med tre heterogena noder, där operativsystemet var den detalj som skiljde dem åt. Operativsystemen som ingick i undersökningen var Windows Server 2008 R2, CentOS 6.2 och FreeBSD 9.0. De faktorer som undersöktes mellan de olika algoritmerna var klustrets genomsnittliga svarstid vid olika belastning och hur många anslutningar som kunde hanteras av klustret, detta gjordes med verktyget httperf. Undersökningen ger svar på hur ett heterogent webbklusters genomsnittligasvarstid och arbetskapacitet kan skilja sig åt beroende på vilken algoritm som används för lastbalansering. Resultatet visar att den genomsnittliga svarstiden håller sig låg tills en hastig stigning inträffar. Shortest Expected Delay och Weighted Least-Connection Scheduling kunde hantera störst antal anslutningar. / This report covers an investigation of different load balancing algorithms in Linux Virtual Server. The investigation was done in a web cluster (with Apache as the software being used) consisting of three heterogeneous nodes, where the operating system was the detail that differentiated the nodes. The operating systems that were used in the investigation were Windows Server 2008 R2, CentOS 6.2 and FreeBSD 9.0. The factors examined were average response time at different load and how many connections the cluster could cope with, these factors were examined by measurements taken with the tool httperf. The investigation gives an answer to how a heterogeneous web clustersaverage response time and working capacity can be affected by the choice of load balancing algorithm. The result shows that the average response time stays low until a sudden rise occurs. Shortest Expected Delay and Weighted Least-Connection Scheduling could handle the largest number of connections.

Vi lever i ett informationssamhälle. Idag hittar vi fakta om vad som helst, var vi än är, genom de gigantiska och otroliga resurser som nås via ICT idag. Med ökad teknisk kapacitet har informationsinsamlingen ökat drastiskt i mängd. Hur vi lagrar data är dock mindre diskuterat. Det nya skifte som kommit fram i datalagring är en flytt från lokalt förvaltade servrar till lagring i molnet. Molntjänster är ett idag allmänt känt begrepp inom IT-branschen, men för att få så mycket uppmärksamhet är termen väldigt vag. Uppsatsen syftar till att reflektera kring molnets innebörd samt utreda om molnet lämpas för datalagring. Studien fastställer vilken affärsnytta en organisation kan utvinna av datalagring i molnet samt om de problem som finns det datalagring idag kan lösas genom att flytta lagringen till molnet. De problem som kommer med den ökade datamängden i informationssamhället samt de lagringstekniker i form av servrar som används idag, presenteras. Teoretiska definitioner av molnet framställs samt hur dessa definitioner skiljer sig från användares synsätt. Resultatet som presenteras ger en definition av hur molntjänster kan användas av organisationer för att lagra data samt vad organisationer kan utvinna av detta. / Today’s information society brings big changes in how we gather information. During the last couple of years the amount of information we store has increased substantially. Techniques for gathering information develops fast, but the way we store information stays the same. This study looks in to cloud computing and if storing data in the cloud is a good alternative to local storage. The definition of cloud computing is vague, and this study attempts to give an account for what cloud computing is through theories and user definitions. Problems with the amount of increased data, and server techniques we use today are presented. The study confirms business advantages with storing data in the cloud and give clearance to that the cloud is working alternative to local storage.

Thesis Price models and SLA for shared services of data centers has as objective to establish best practice, so-called "best practices" of SLA and price models for data center services. Work is divided into two parts, theoretical and practical part. The theoretical section is wants to familiarize the reader with the basic concepts such as outsourcing, reasons and risks of use. I describe the base models for providing IT services as well as pricing models for services as described in the literature. I will focus on data centers and TIER standard categorization, too. The practical part is based on an analysis of information that I got from an interview with the experts working for the biggest data center companies in the Czech Republic. Based on this information, I tried to compile the best practices for creating pricing models for data center services that are actually used in practice. Specifically, the server housing, server hosting and virtual server services. Also, for these services create an SLA that can be used by some data center company in the Czech Republic.