‪#‎Virtualization‬ and Types - Explained

‪#‎Virtualization‬ and Types - Explained
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1) What is meant by Virtualization.?
=> Virtualization is the creation of a virtual (rather than actual) version of something, such as an ‪#‎operating_system‬, a ‪#‎server‬, a ‪#‎storage‬ device or ‪#‎network‬ resources,mainly to utilize under-used resources on the physical host. ‪#‎UnhappyGhost‬

2) Why do we go for virtualization ?
=> Virtualization will help you save time taken for maintaining the IT physical infrastructure,thereby helps you to focus more on the Quality of Service which you offer. This content was post on http :// www. facebook .com/geeksch00l ‪#‎GeekSchool‬ ‪#‎GeekSch00l‬

a) Reduce Cost and save power : Running multiple VMs on a server will reduce the need for having separate physical servers for running applications, thereby reducing the cost for buying and managing physical servers.It will also reduce the power consumption. This content was post on http :// www. facebook .com/geeksch00l

b) Backup and Recovery : Backup and Recovery process will be made easier.

c) Reduce Loss Of Service : ‪#‎Migration‬ of servers and upgradation of resources without Loss of service or minimal ‪#‎downtime‬.

Virtualization can be broadly classified into three types

1) Server Virtualization
2) Storage Virtualization
3) Network virtualization

Lets have a look at each of this .

1) Server Virtualization
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It is the abstraction of computer resources, in simple words, the mechanism to run multiple instances/copies of various operating systems inside a base operating system, mainly to utilize under-used resources on the physical host. This content was post on http :// www. facebook .com/geeksch00l

Server virtualization is the masking of server resources (including the number and identity of individual physical servers,processors, and operating systems) from server users. The intention is to spare the user from having to understand and manage complicated details of server resources while increasing resource sharing and utilization and maintaining the capacity to expand later. This content was post on http :// www. facebook .com/geeksch00l

Various server virtulization softwares in use nowadays are ‪#‎VMware‬, VMware ESX/ESXi, ‪#‎KVM‬, ‪#‎XEN‬, ‪#‎OpenVZ‬, ‪#‎Hyper_V‬, ‪#‎Qemu‬ etc.

2)Storage Virtualization
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Storage virtualization is the pooling of physical storage from multiple network storage devices into what appears to be a single storage device that is managed from a central console. Storage virtualization is commonly used in storage area networks (‪#‎SANs‬).

Storage virtualization can be achieved using three methods

Host-based storage virtualization means that a driver of some sort is installed on the host operating system, and it intercepts and possibly redirects IO requests. The File Area Network (FAN) concept uses this, but software ‪#‎RAID‬ and volume managers are also an example of host-based storage virtualization. This content was post on http :// www. facebook .com/geeksch00l

Network-based storage virtualization is extremely interesting. A ‪#‎fibre_channel‬ switch that sits between the host and storage will actually virtualize all requests, redirecting IO unbeknownst to the user. This method doesn’t rely on the operating system, in fact the operating system on the host doesn’t even know its happening. This is true virtualization, though you must be extremely careful about interoperability between your switch and storage array vendors. This content was post on http :// www. facebook .com/geeksch00l

Array-based Virtualization means that one “master” array will take over all IO for all other arrays. It must be fast enough to handle all your aggregate storage traffic, and it must also interoperate with all your existing disk arrays to realize the benefits. This method of Virtualization provides the most benefits, including centralized management and seamless data migration. This content was post on http :// www. facebook .com/geeksch00l

3) Network Virtualization
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Network Virtualization is a method of combining the available resources in a network by splitting up the available ‪#‎bandwidth‬ into channels, each of which is independent from the others, and each of which can be assigned (or reassigned) to a particular server or device in real time. The idea is that virtualization disguises the true complexity of the network by separating it into manageable parts, much like your partitioned hard drive makes it easier to manage your files. This content was post on http :// www. facebook .com/geeksch00l
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