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Live Migration
Live migration refers to the process of moving a running virtual machine (VM) or application between different physical machines without disconnecting the client or application. Memory, storage, and network connectivity of the virtual machine are transferred from the original guest machine to the destination. The time between stopping the VM or application on the source and resuming it on destination is called 'downtime'. When the downtime of a VM during live migration is small enough that it is not noticeable by the end user, it is called a 'seamless' live migration. Live migration of Virtual Machines Two techniques for moving the virtual machine's memory state from the source to the destination are pre-copy memory migration and post-copy memory migration. Pre-copy memory migration Pre-copy phase In pre-copy phase, the Hypervisor copies all the memory pages from source to destination while the VM is still running on the source. If some memory pages change (become 'dirty') d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virtual Machine
In computing, a virtual machine (VM) is the virtualization/ emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination. Virtual machines differ and are organized by their function, shown here: * '' System virtual machines'' (also termed full virtualization VMs) provide a substitute for a real machine. They provide functionality needed to execute entire operating systems. A hypervisor uses native execution to share and manage hardware, allowing for multiple environments which are isolated from one another, yet exist on the same physical machine. Modern hypervisors use hardware-assisted virtualization, virtualization-specific hardware, primarily from the host CPUs. * Process virtual machines are designed to execute computer programs in a platform-independent environment. Some virtual machine emulators, such as QEMU a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Windows Server 2008 R2
Windows Server 2008 R2 is the fifth version of the Windows Server operating system produced by Microsoft and released as part of the Windows NT family of operating systems. It was released to manufacturing on July 22, 2009, and became generally available on October 22, 2009, shortly after the completion of Windows 7. It is the successor to Windows Server 2008, which is derived from the Windows Vista codebase, released the previous year, and was succeeded by the Windows 8-based Windows Server 2012. Enhancements in Windows Server 2008 R2 include new functionality for Active Directory, new virtualization and management features, version 7.5 of the Internet Information Services web server and support for up to 256 logical processors. It is built on the same kernel used with the client-oriented Windows 7, and is the first server operating system released by Microsoft to exclusively support 64-bit processors, a move which was followed by the consumer-oriented Windows 11 in 2021. Win ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of Platform Virtualization Software
Platform virtualization software, specifically emulators and hypervisors, are software packages that emulate the whole physical computer machine, often providing multiple virtual machines on one physical platform. The table below compares basic information about platform virtualization hypervisors. General Features * Providing any virtual environment usually requires some overhead of some type or another. Native usually means that the virtualization technique does not do any CPU level virtualization (like Bochs), which executes code more slowly than when it is directly executed by a CPU. Some other products such as VMware and Virtual PC use similar approaches to Bochs and QEMU, however they use a number of advanced techniques to shortcut most of the calls directly to the CPU (similar to the process that JIT compiler uses) to bring the speed to near native in most cases. However, some products such as coLinux, Xen, z/VM (in real mode) do not suffer the cost of CPU-level sl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virtual Machine
In computing, a virtual machine (VM) is the virtualization/ emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination. Virtual machines differ and are organized by their function, shown here: * '' System virtual machines'' (also termed full virtualization VMs) provide a substitute for a real machine. They provide functionality needed to execute entire operating systems. A hypervisor uses native execution to share and manage hardware, allowing for multiple environments which are isolated from one another, yet exist on the same physical machine. Modern hypervisors use hardware-assisted virtualization, virtualization-specific hardware, primarily from the host CPUs. * Process virtual machines are designed to execute computer programs in a platform-independent environment. Some virtual machine emulators, such as QEMU a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-system Image
In distributed computing, a single system image (SSI) cluster is a cluster of machines that appears to be one single system. The concept is often considered synonymous with that of a distributed operating system, but a single image may be presented for more limited purposes, just job scheduling for instance, which may be achieved by means of an additional layer of software over conventional operating system images running on each node. The interest in SSI clusters is based on the perception that they may be simpler to use and administer than more specialized clusters. Different SSI systems may provide a more or less complete illusion of a single system. Features of SSI clustering systems Different SSI systems may, depending on their intended usage, provide some subset of these features. Process migration Many SSI systems provide process migration. Processes may start on one node and be moved to another node, possibly for resource balancing or administrative reasons.for example ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MOSIX
MOSIX is a proprietary distributed operating system. Although early versions were based on older UNIX systems, since 1999 it focuses on Linux clusters and grids. In a MOSIX cluster/grid there is no need to modify or to link applications with any library, to copy files or login to remote nodes, or even to assign processes to different nodes – it is all done automatically, like in an SMP. History MOSIX has been researched and developesince 1977at The Hebrew University of Jerusalem by the research team of Prof. Amnon Barak. So far, ten major versions have been developed. The first version, called MOS, for ''Multicomputer OS'', (1981–83) was based on Bell Lab's Seventh Edition Unix and ran on a cluster of PDP-11 computers. Later versions were based on Unix System V Release 2 (1987–89) and ran on a cluster of VAX and NS32332-based computers, followed by a BSD/OS-derived version (1991–93) for a cluster of 486/Pentium computers. Since 1999 MOSIX is tuned to Linux for x86 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OpenSSI
OpenSSI is an open-source single-system image clustering system. It allows a collection of computers to be treated as one large system, allowing applications running on any one machine access to the resources of all the machines in the cluster. OpenSSI is based on the Linux operating system and was released as an open source project by Compaq in 2001. It is the final stage of a long process of development, stretching back to LOCUS, developed in the early 1980s. Description OpenSSI allows a cluster of individual computers (''nodes'') to be treated as one large system. Processes run on any node have full access to the resources of all nodes. Processes can be migrated from node to node automatically to balance system utilization. Inbound network connections can be directed to the least loaded node available. OpenSSI is designed to be used for both high performance and high availability clusters. It is possible to create an OpenSSI cluster with no single point of failure, for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CloudEndure
CloudEndure is a cloud computing company that develops business continuity software for disaster recovery, continuous backup, and live migration. CloudEndure is headquartered in the United States with R&D in Israel. History CloudEndure was founded in 2012 by Ofer Gadish (CEO), Gil Shai (CRO), Ofir Ehrlich (VP R&D), and Leonid Feinberg (VP Product). The same founders previously established AcceloWeb, which was acquired by Limelight Networks in 2011. CloudEndure has raised a total of $18.2 million from private investors and companies such as Dell EMC, VMware, Mitsui, Infosys, and Magma Venture Partners. Awards for CloudEndure include the 2017 CRN Emerging Vendors Award for Storage Startups and the 2016 Gartner Cool Vendor Award. CloudEndure products have been integrated as OEM software for several partner company services, including an integration into Google Cloud VM Migration Service and integrations with Cisco Systems CloudCenter Disaster Recovery and Migration and Sungar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Google Cloud Platform
Google Cloud Platform (GCP), offered by Google, is a suite of cloud computing services that runs on the same infrastructure that Google uses internally for its end-user products, such as Google Search, Gmail, Google Drive, and YouTube. Alongside a set of management tools, it provides a series of modular cloud services including computing, data storage, data analytics and machine learning. Registration requires a credit card or bank account details. Google Cloud Platform provides infrastructure as a service, platform as a service, and serverless computing environments. In April 2008, Google announced App Engine, a platform for developing and hosting web applications in Google-managed data centers, which was the first cloud computing service from the company. The service became generally available in November 2011. Since the announcement of App Engine, Google added multiple cloud services to the platform. Google Cloud Platform is a part of Google Cloud, which includes the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jelastic
Jelastic is a cloud platform software vendor that provides multi-cloud Platform as a Service-based on container technology for hosting service providers, ISVs, telecommunication companies, enterprises and developers. The platform is available as public cloud in over 70 data centers, as well as virtual and on-premises servers. Jelastic provides support of Java, PHP, Ruby, Node.js, Python, Go environments, custom Docker containers and Kubernetes clusters. Jelastic's co-founder and CEO was Ruslan Synytskyy. History Jelastic was founded in 2011 as a public cloud. Initially, it was a Platform as a Service specifically targeted on Java hosting. In 2012, the company received the Java Duke Choice Award. From 2013 to 2015, the platform added support of PHP, Ruby, Python, Node.js, .NET and support of Docker containers. The latest runtime addition was in 2017 by integrating GoLang. In 2014, a private cloud solution was introduced, and by 2015, the platform could be used as a hybrid a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proxmox Virtual Environment
Proxmox Virtual Environment (Proxmox VE or PVE) is an open-source software server for virtualization management. It is a hosted hypervisor that can run operating systems including Linux and Windows on x64 hardware. It is a Debian-based Linux distribution with a modified Ubuntu LTS kernel and allows deployment and management of virtual machines and containers. Proxmox VE includes a web console and command-line tools, and provides a REST API for third-party tools. Two types of virtualization are supported: container-based with LXC (starting from version 4.0 replacing OpenVZ used in version up to 3.4, included), and full virtualization with KVM. It includes a web-based management interface. Proxmox VE is licensed under the GNU Affero General Public License, version 3. History Development of Proxmox VE started when Dietmar Maurer and Martin Maurer, two Linux developers, found out OpenVZ had no backup tool and no management GUI. KVM was appearing at the same time in Linux, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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