surgical steel body jewelry wholesale Seting down time during Xen virtual motivation migration process

empire jewelry wholesale There are several categories:
2.1, virtual hardware mode
The virtual hardware model establishes an abstract virtualization platform between computers, storage and network hardware, so that all hardware is unified to a virtualized layer middle. At present, the typical products of such virtual machines include VMware, GSX Server, ESX Server, and Microsoft Virtual PC, Virtual Server, Parallels, etc.
The virtual hardware mode Features: Virtual Intel X86 platform can run multiple operating systems and applications at the same time. By using the virtualized layer, it provides a hardware -level virtual, that is, the virtual machine provides a set of virtual Intel X86 compatible hardware for the operating system image running in the virtual machine. This set of virtual hardware virtuals all the equipment owned by the real server: motherboard chip, CPU, memory, SCSI and IDE disk device, various interfaces, display and other input and output devices. In addition, each virtual machine can be packaged independently into a file, and the virtual machine can be flexibly migrated.
2.2. The virtual operating system mode
The virtual operating system model is a virtual layer based on the host operating system running by the virtual machine to use it to the operating system for virtual machine hosts. On this virtual layer, multiple interconnected virtual special servers (VPS) can be created. These VPSs can maximize efficiency sharing hardware, software licenses and management resources.对其用户和应用程序来讲，每一个VPS平台的运行和管理都与一台独立主机完全相同，因为每一个VPS均可独立进行重启并拥有自己的root访问权限、用户、IP地址、内存、 Processes, files, applications, system function libraries and configuration files. For product servers running multiple applications and actual data, virtual machines of virtual operating systems can reduce cost consumption and improve system efficiency. At present, SWSOFT's Virtuozzo is a mature product in this field.
2.3, xen (semi -virtualization technology)
In the increasing list of virtualization technology, Xen is one of the most striking technologies recently. Xen was developed at the University of Cambridge as a research project, and it has been greatly promoted in the open source community. Xen is a semi -virtual () Virtual Machine Monitor, which means that in order to call the system management program, it is necessary to modify the operating system. However Essence Xen is a special virtual hardware virtual machine with most of the characteristics of virtual hardware virtual machines. The biggest difference is that Xen needs to modify the operating system kernel.
At present, Xen only supports the Linux virtual machine implemented on the Linux system. However, its new version will support Intel-Vt of Intel's hardware virtual technology, which will be used to solve the difficulty of XEN in the virtualized Windows system.
VMware is still a leader in the field of virtual technology. In terms of product maturity, it still has obvious advantages than Xensource. However, many people in the industry believe that due to open source reasons, Xen's strength will become stronger and stronger. At present, the giant Red Hat and Novell in the open source field have begun to integrate the technology into their Red Hat Linux 5 systems and Novell, SUSE Linux Server 10 system.
3. The benefits of using virtual technology
3.1. The disadvantages of deploying the server in the traditional method
1. High cost
-high hardware cost.
-Operation and maintenance costs are high, including data center space, cabinets, network cables, power consumption, air -conditioning air conditioning and labor costs.
2. Utility
-low availability, because each server is a single machine, if it is configured as a dual -machine mode, the cost is higher.
-System maintenance and upgrade or capacity need to be stopped when it is interrupted.
3. Lack of managed
-The number is too difficult to manage. The deployment time of new servers and applications is long, which greatly reduces server reconstruction and application loading time.
-Hardware maintenance takes several days/week change management preparation and several hours of maintenance window.
4. Poor compatibility
-The system and application migrate to the new hardware that needs to be compatible with the old system.
3.2. The advantages of the virtual architecture
In virtual architecture, users can consider resources as exclusive to them, while administrators can manage and optimize the entire resources within the scope of the enterprise. VMware's virtual architecture can reduce the company's IT cost by increasing efficiency, flexibility and response capabilities. Managing a virtual architecture allows the IT department to connect and manage resources faster to meet the needs of business. Its advantages mainly include the following aspects:
1) 35%-75%TCO savings
In the integration of multiple physical servers to a physical server by 40%software hardware costs;
's integration ratio : The production environment 10-15: 1, the development test environment 15-20: 1;
The average utilization rate of each server increases from 5%-15%to 60%-80%;
80%of operating costs, including data center space, cabinets, network cables, power consumption, air -conditioning air conditioning and labor costs.
2) Improve operational efficiency
In deployment time from small levels to minutes, server reconstruction and application loading time from 20-40 HRS => 15-30 min, saving 10,000 people/h each year );
The previous hardware maintenance required for the two days/week change management preparation and 1-3 -hour maintenance window. Now zero -downs hardware maintenance and upgrade can be performed.
3) Improve service levels
In the relationship between business and IT resources to help your enterprise and the priority of business priority;
And automatically deploy dynamic resources on demand;
The on -demand expansion without interruption.