Server virtualization knowledge


1. On a particular server, can each virtual machine run any version of Windows? Server virtualization for the Windows server operating system (or Linux) you use on each virtual machine There are no version restrictions, however, the new version of Windows requires you to check its compatibility with your server virtualization software before installation. 2. Restart the virtual machine, will it affect other virtual machines? Restarting the virtual machine does not require access to the server or server virtualization software. Restarting virtualization has no effect on other virtual machines. Virtual machines are completely isolated from each other. However, if you restart the physical server (that is, you restart the server virtualization software), it will interrupt the operation of all virtual machines. 3. How do I assign tasks to virtual machines? In general, it's best to combine heavy-duty and light-duty applications on each physical server to get the most out of your server. In terms of performance, heavy-duty applications can benefit from the use of large amounts of processor and memory resources at peak traffic times, and light-duty applications can effectively pass through the server. 4. Can virtualization and blade servers work together? Techniques should be carefully combined to avoid placing too many eggs in one basket. There are no technical errors or difficulties in installing server virtualization software on a blade server. However, don't do this without carefully considering the concentration risks it produces. For example, if you build 10 virtual machines on each of the 16 blade servers, a total of 160 applications are run on the rack of the blade. If there is a problem with this rack (fire or power outage) and there is not enough backup or redundancy (outside the rack), you will lose 160 applications at the same time and bring disaster to your business. 5. Do I need to change the storage when the server is virtualized? The storage LAN is ideal. You should have already set up a storage area network in the data center or you have extended the storage area network service to those servers that the virtual machine will replace. 6. Does virtualization use minimize impact when a business disruption occurs? Increase the level of redundancy to avoid the impact of multiple applications or services, even if you don't worry about the combination of blade server and server virtualization, using server virtualization on a standard server puts many eggs in one basket. Considering that a server failure can cause 10 applications or database interruptions, in general, the ideal situation is to provide the same level of redundancy, allowing the entire contents of this server to be the entire server when the primary server fails. The content is quickly transferred to a standby server. 7. Where should the application and database instances be placed? In general, it is best to specify the physical server as the "development", "test/quality assurance" and "production" servers, and place the application instances and databases on those servers accordingly. This policy is driven by the need for security. In some industries, management considerations require different treatment of different environments (especially production environments). 8. Is it more difficult to track software licenses in a virtualized environment? In an ideal data center, it is not difficult to track software licenses for virtualized servers. However, real-world operations show that this is indeed very difficult. In a virtualized environment, virtual machines are easy to create and it is difficult for business units to discover what software is needed on each virtual machine or what software is already installed, making tracking license requirements and license usage very difficult. 9. Will security management become more difficult after server virtualization? Fully guaranteeing the security of accessing virtual machines and storing information on virtual machines is more difficult than traditional physical environments. First, access to virtualization software must be tightly controlled. Second, anyone with access to a virtual machine can download an application to isolate the virtual “wall” of each virtual machine. Third, for each virtual machine, implementing network-level access restrictions is more complicated, so network-based security may end up being set up on less sensitive applications running on a physical server (especially Is it if this network/firewall management team is busy). 10. When introducing virtualization, is the management database redesigned? A thorough redesign of the underlying database (that is, the solution) is required. If it is not possible to redesign using the current configuration management database, you must purchase a new configuration management database software. Although many configuration management database software vendors have begun to adopt server virtualization, many older versions of configuration management database software are used in the data center. These older versions of the software may not be able to treat the virtual machine as a "data entry" that does not recognize the relationship of the virtual machine A& quoquo; on the physical server X. Many things on the physical server, such as the installed operating system version and IP address, must now be associated with the virtual machine. In addition, these things must also be associated with non-virtualized servers. These requirements mean that the database design under the configuration management database needs to be completely modified to be used in data centers that have already introduced virtualization. 11. Is there a reduction in software costs in a virtual server environment compared to a traditional server environment? Software license costs will increase as business units demand more "machines" (business units know that adding virtual machines is easy and cheap). Once the IT department tells the business that he can deploy a new virtual machine within a few hours, the nature of human greed will prevail. The business unit will frantically submit a virtual machine application. If they are waiting for approval to purchase physical server budgets, place orders, deliveries, install and set up, they will hesitate when they apply. Some experts call this result “virtual machine sprawl”. To make matters worse, when a plan is cancelled or the development work is completed, the business unit will tell the IT department that the virtual machine can be revoked? Of course not. 12. Is there a reduction in the number of people in a fully applied virtualized data center compared to a traditional data center? The number of technical support staff for servers and operating systems is roughly the same. Much of the work done by the data center is driven by the number of "servers". Whether these servers are virtual or physical is no different. Each virtual machine is treated the same as a physical server in terms of handling tickets, managing operating system and application updates and patches, managing security issues, monitoring performance, and more. The small amount of total work that is reduced by not having to install a physical server is offset by the task of installing and setting up a server virtualization system such as VMware on each new virtual machine.

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