Study of the modifications needed for effective operation NASTRAN on IBM virtual storage computers

The necessary modifications were determined to make NASTRAN operational under virtual storage operating systems (VS1 and VS2). Suggested changes are presented which will make NASTRAN operate more efficiently under these systems. Estimates of the cost and time involved in design, coding, and implementation of all suggested modifications are included

Axon: Network Virtual Storage Design

This paper describes the design of network virtual storage (NVS) in the Axon host communications architecture for distributed applications. The Axon project is investigating an integrated design of host architecture, operating systems, and communications protocols to allow applications to utilize the high bandwidth provided by the next generation of communications networks. NVS extends segmented paged virtual storage management and address translation mechanisms to include segments located across an internetwork. This provides the ability to efficiently use the shared memory paradigm in non-local environments, as well as the support for a very high speed end-to-end data path between demanding applications such as scientific visualization and imaging

Виртуальные системы хранения данных

This article outlines the principles of virtual storage systems and their features

Implementation of NASTRAN on the IBM/370 CMS operating system

The NASA Structural Analysis (NASTRAN) computer program is operational on the IBM 360/370 series computers. While execution of NASTRAN has been described and implemented under the virtual storage operating systems of the IBM 370 models, the IBM 370/168 computer can also operate in a time-sharing mode under the virtual machine operating system using the Conversational Monitor System (CMS) subset. The changes required to make NASTRAN operational under the CMS operating system are described

The NOAO Data Lab virtual storage system

Collaborative research/computing environments are essential for working with the next generations of large astronomical data sets. A key component of them is a distributed storage system to enable data hosting, sharing, and publication. VOSpace is a lightweight interface providing network access to arbitrary backend storage solutions and endorsed by the International Virtual Observatory Alliance (IVOA). Although similar APIs exist, such as Amazon S3, WebDav, and Dropbox, VOSpace is designed to be protocol agnostic, focusing on data control operations, and supports asynchronous and third-party data transfers, thereby minimizing unnecessary data transfers. It also allows arbitrary computations to be triggered as a result of a transfer operation: for example, a file can be automatically ingested into a database when put into an active directory or a data reduction task, such as Sextractor, can be run on it. In this paper, we shall describe the VOSpace implementations that we have developed for the NOAO Data Lab. These offer both dedicated remote storage, accessible as a local file system via FUSE, and a local VOSpace service to easily enable data synchronization

Internet Virtual Storage sebagai Alternatif Penyimpanan Data

Hampir seluruh aspek kehidupan manusia saat ini tidak dapat dilepaskan dari teknologi, khususnya teknologi komputer. Revolusi Teknologi Informasi(TI) ikut mengubah perilaku masyarakat modern yang mencoba masuk dan menghirup atmosfer sebuah kebudayaan baru, suatu kecenderungan terciptanya “masyarakat tanpa kertas”. Untuk menuliskan suatu dokumen, orang cenderung sudah meninggalkan mesin ketik manual dan sudah digantikan perannya oleh komputer. Selain itu pengarsipan data sudah mulai meninggalkan kertas, dan menyimpannya dalam media penyimpanan seperti disket, CD, hardisk dan sebagainya. Banyaknya kejadian seperti kerusuhan, bencana alam yang terjadi misalnya gempa bumi, banjir yang menghancurkan gedung-gedung perkantoran yang sekaligus menghancurkan komputer beserta data-data didalamnya, telah memunculkan alternatif penyimpanan data dengan memanfaatkan TI, yaitu dengan metode penyimpanan data di server, yang back-upnya bisa dibuat dalam beberapa versi dan bisa dilindungi dengan sistem keamanan berlapis. Beberapa cara yang dapat digunakan diantaranya adalah dengan memanfaatkan fasilitas email dan menggunakan layanan perusahaan penyedia internet service storage. Perusahaan penyedia layanan bertugas menyimpan dan membackup data yang dikirimkan pada server mereka, dengan demikian data yang tersimpan dapat diambil, diakses kembali kapanpun dan dimanapun berada selama masih terhubung ke internet. Perlu diingat bahwa keamanan data di email tidaklah 100% terjamin dan selalu ada resiko terbuka untuk umum, dalam artian semua isinya dapat dibaca oleh orang lain. Hal ini disebabkan oleh karena data itu akan melewati banyak server sebelum sampai di tujuan. Tidak tertutup kemungkinan ada orang yang menyadap data yang dikirimkan tersebut. Untuk itu data dapat diamankan dengan melakukan teknik pengacakan atau enkripsi. Begitu juga pada internet service storage, meskipun penyedia layanan sudah melakukan pengamanan dengan secure http (https), tak ada salahnya apabila dilakukan pengamanan sendiri terhadap data dengan cara dienkripsi. Kata kunci : email, internet service storag

Penerapan Logical Unit Number (LUN) Pada Drobo Virtual Storage Dengan Metode Network Development Life Cycle (NDLC)

Sejalan dengan perkembangan perusahaan yang semakin besar seiring pekembangan teknologi informasi yang digunakan, yang selanjutnya akan pula berpengaruh pada penyediaan alat penyimpanan yang dapat menampng data yang beroperasi selama 24 jam. Hal ini yang mendorong PT. Pertiwi Agung, yang saat ini akan mengembangkan usahanya, meski saat ini memiliki pangsa pasar di sekitar Asia Tenggara. Perusahaan harus dapat menyimpan seluruh data yang sudah dapat dipastikan akan sangat besar. Untuk itu diperlukan sebuah media, media itu adalah Virtual Storage yang di atur oleh Drobo, sebuah alat penyimpanan eksternal dengan mengandalkan Logical Unit Number yang dapat mengidentifikasikan seluruh peralatan yang digunakan. Agar lebih terarah, maka proses implementasi Logical Unit Number pada Virtual Storage ini mengunakan metode Network Development Life Cycle (NDLC).Hasil dari penerapan Logical Unit Number ini adalah data yang cukup banyak ini dapat terbaca dan terintegrasi, meski media penyimpanannya tersebar di beberapa tempa

Partitioning and protecting control program function through virtual storage

Many operating systems are endowed with the ability to access every byte of addressable memory in the processor complex. Unfortunately, a control program so designed creates an exposure of the following nature: It is possible for an errant section of operating system code to unwittingly modify (and perhaps destroy) either its own storage or the storage of others. This thesis addresses this problem and discusses the design and implementation of a control program in which many such attempts at destroying storage are detected and suppressed. This is accomplished by placing separate control program functions in separate virtual storages. The thesis also expounds upon the notions of protection and security within the operating system itself, and details a quasi capability mechanism that regulates the access to shared objects and ensures the invocation of one control program function by another is authorized

HVSTO: Efficient Privacy Preserving Hybrid Storage in Cloud Data Center

In cloud data center, shared storage with good management is a main structure used for the storage of virtual machines (VM). In this paper, we proposed Hybrid VM storage (HVSTO), a privacy preserving shared storage system designed for the virtual machine storage in large-scale cloud data center. Unlike traditional shared storage, HVSTO adopts a distributed structure to preserve privacy of virtual machines, which are a threat in traditional centralized structure. To improve the performance of I/O latency in this distributed structure, we use a hybrid system to combine solid state disk and distributed storage. From the evaluation of our demonstration system, HVSTO provides a scalable and sufficient throughput for the platform as a service infrastructure.Comment: 7 pages, 8 figures, in proceeding of The Second International Workshop on Security and Privacy in Big Data (BigSecurity 2014

Virtual storage implementation on a microcomputer

Virtual storage is a hardware memory management technique which is gaining popularity amongst modern mainframe computers and top of the range minicomputers. It offers huge memory resources at lower cost in comparison to solid state memories of compatible size. The associated benefits are reduced component counts and lower power requirement. The trade off for the above mentioned advantages is an increase in the memory average access time. However this increase in the average access time does not appear to be a major handicap for many computer applications. With the widespread acceptance of microcomputer systems these days, more sophisticated and increasingly more complex programmes are being run on microcomputers. Demands are placed on the microcomputers for bigger memory recourses. Also the new generation microprocessors can now cater for an addressing space of many mega bytes. It is obvious that virtual storage technique is ideally suited for these new generation microprocessors since a large real memory implementation is impracticable and is out of question economically. This project investigated the feasibility of adapting an existing IMP-16C microcomputer system into a virtual storage system, assuming that a microcomputer system is single user orientated. Some of the virtual storage techniques were reviewed, in particular those that have been studied with a computer simulation of a virtual storage system. A working virtual storage computer system was implemented on the National Semiconductor IMP-16C microcomputer. the results of the simulation study. The design was based on A virtual memory of 256 K words of 16 bits was achieved. The cost to equip a system with an equivalent size real memory is about ten times the cost to manufacture the virtual storage controller. The average access time of the virtual storage computer system as implemented is an order higher than the conventional real memory system. Supplementary techniques and faster auxiliary storage can be employed to improve the average access time. This project demonstrated that a virtual storage controller can be coupled to an existing microprocessor to provide virtual memory storage at about one tenth the cost to provide the equivalent real memory storage. The virtual storage controller can be divided quite readily into functional blocks. Each block is suitable for chip level integration with LSI or VLSI technology. Implementing a virtual storage system around an existing microprocessor would be a much simpler task when these functional chips are available.Thesis (MESc) -- University of Adelaide, Department of Electrical Engineering, 198