Virtuozzo Storage. Распределенное отказоустойчивое хранилище данных для ВМ.
This paper describes Virtuozzo Storage - a product from Virtuozzo product line which can be used to turn hard drives from several servers into distributed, fault-tolerant cluster able to store data of virtual environments.
Automated laboratory and course works check for university subjects related to programming is an up-to-date task because it requires support of a big number of software environments during all period of study. Support cost for these environments grows fast because apart from keeping particular software versions, environments also should be isolated from each other and highly available for students. The work describes possible solution for automatic check of student laboratory works applied for "Linux programming basics" and "Linux Kernel Modules programming" MOOCs. The solution is a complex information system which uses virtual machines as containers for student solutions check environments. The system process student solutions for course problems which are represented as C programs and Makefiles. The check procedure includes compilation, launch and results interpretation for particular submission. During the procedure, the information system reduces mutual influence of submissions, provides unified software environment and repeatedly reproduced check results.
This article gives an overview of the comprehensive system that supports training and retraining specialists in a field of information and telecommunication technologies. The system consists of LMS and a number of managed virtual environments for doing practical works in a distance learning mode.
The boor develops a new approach to the study of social reality in its denamics based on the revealing of connections between social and anthropological phenomena. The fundament of the approach is synergic anthropology, in the frame work of which the apparatus for the description and analysis or the "colonization" of the interface of the Social and the Anthropological is constructed. A new class of concepts is introduced, the categories of the interface, the examples of which are anthropological situation, anthropological trend, spiritual tradition etc. Anthropological trends serve as the main tool are developed, the diagnostics (the identification of anthropological formation(s), which generate trend in question) and the control (the stimulation of a trend, the blocking of it etc.). The framework is then applied to analysis of the most topical modern problems such as global risks, ecological crisis, the grwth of the virtualization of reality, the problem of the Post-human etc. Special attention is paid to the "Exit trend", which is how we call the overall anthropological trend collecting all manifestations and tendencies of the specific tiredness of the Human and his/her drive to a self-withdrawal. Using our methods of the control of trends, it is possible to formulate strategies for changing and correcting anthroposocial situation. We find that two phenomena play important role in these strategies, the transition of modernity into the postsecular paradigm, and the return of the Onthological Human, the fnthropological formation constituted in religious expirience and forced out by the po\rocesses of secularization. In the conceptual context of modern social philosophy the approach uniting social and anthropological reality in a new light, and provides new principles for determining our attitudes and strategies towards leading trends of modernity.
Accuracy of aircraft district location determination in changing daily, weather climatic conditions is a crucial factor which civil and military aviation usage efficiency and sometimes appropriateness is dependent on. Despite permanent inertial and satellite navigating systems, which all modern aircrafts are equipped, by performance quality improvement still required accuracy of aircraft district location determination is not reached. This fact still forces to use three-dimensional navigating systems which are installed aboard of specialized aircrafts for civil applications and which are essential for military aircraft of 5th generation. Latest three-dimensional navigating systems investigations show that their performance accuracy improvement requires joint use of methods and algorithms of estimation, identification and test of hypothesis during stereoscopic pairs of large ground images real-time processing. Therefore success of three-dimensional navigating systems practical usage is mainly defined by performance, computing stability and fault tolerance of onboard computing systems which are dominantly based on RISC-processors and FPGA-video-processors (Field Programmable Gate Array). The received empirical estimations of required performance, computing stability and fault tolerance show: 1. The elementary searchless district location determination based on one stereopair processing requires ~(0,12-0,6) *108 operations of multiplication and addition. Such a task is able to be processed in 1 second by RISC-processor with performance not below some Gflops, taking into account computing organization system time costs. 2. If micro program management intermediate level is presented in FPGA-technologies based on VHDL than algorithmically-focused MIMD-bit-stream three-dimensional navigating systems videoprocessor is potentially implementable on the basis of one VLSI FPGA Xilinx Virtex 6. Such a processor is possible to achieve performance of V=FT*Lp/n=500*106*192/64≈1,5*109 operations per second in double-format. This performance rate is enough for target size stereopairs processing rate of 25÷125 images per second so given performance exceeds algorithmic costs for one required format stereopair processing exactly this amount of times. Here: FT - bit-matrix clock rate, Lp - one cycle operations quantity, n - arithmetics capacity. It is fundamental that there are no system time costs on real-time computing resources management in MIMD-bit-stream computing technologies so that computing expenses become comparable with algorithmic in such videoprocessors. 3. Despite the fact that required by three-dimensional navigating systems algorithms computing performance and accuracy are achievable both in RISC-architecture and specialized FPGA-based architectures, 5th generation aircrafts such as F-35 should stabilize flight parameters, used for high-precision own location determination, which is realizable only at its separate stages. At the same time it should be kept in mind that computing paralleling index increase more than 4 times may lead to loss of onboard three-dimensional navigating system computer based on RISC-platforms computing stability. 4. RISC-architecture fault tolerance more than 10 times less than specialized FPGA-bit-stream architectures one. It is the most essential for spaceships which lifetime should exceed VLSI components nonfailure operating time more than 10 times. Such fault tolerance indicators qualitative divergence is caused by: - indifferent failures presence in bit-stream architectures which quantity exceeds ratio of failures parried by RISC-architecture processors majority reservation schemes; - possibility of ~112 times bit-stream microprograms field re-allocation on a bit matrix tolerantly operating failure map.
The use of hardware virtualization for ensuring information security is discussed. A review of various approaches to improving the security of software systems based on virtualization is given. A review of possible scenarios of using virtualization by intruders is also presented. The application domains and limitations of the available solutions and perspectives of future development in the field are discussed.
This paper examines the changes in the ethics of business communication associated with virtualization. The transfer of business communication to virtual space alters the very process of interaction and, as a consequence, ethical principles in a professional environment.
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
Existing approaches suggest that IT strategy should be a reflection of business strategy. However, actually organisations do not often follow business strategy even if it is formally declared. In these conditions, IT strategy can be viewed not as a plan, but as an organisational shared view on the role of information systems. This approach generally reflects only a top-down perspective of IT strategy. So, it can be supplemented by a strategic behaviour pattern (i.e., more or less standard response to a changes that is formed as result of previous experience) to implement bottom-up approach. Two components that can help to establish effective reaction regarding new initiatives in IT are proposed here: model of IT-related decision making, and efficiency measurement metric to estimate maturity of business processes and appropriate IT. Usage of proposed tools is demonstrated in practical cases.