All You need to know about KVM VPS Technology
Virtualization is a concept that has transformed the IT industry. Virtualization is the combination of software and hardware configuration which allows you to install and run multiple, separate operating systems on top of a computer. Let me emphasize that again. You can install multiple operating systems on top of a server and take advantage of all the hardware.
Virtual Private Servers Became the Norm
As soon as virtualization technology was incepted, virtual machines or private servers became the norm. IT administrators quickly realized the benefits of this technology. Businesses saw a significant return on investment as soon as this technology was implemented. In the past, servers would be deployed multi-purpose such that the resources were not wasted. Deploying multiple functions in one server became a security concern. One example of such deployment is Windows Servers running active directory domain controller software. IT admins would install active directory, file servers, and web servers on the same server in the past. This significantly increased the exposure of the server to attacks.
With virtual private servers, IT admins now could isolate the domain controller to one operating system, the webserver in another, and the file server. All of this was still accomplished with one server, which allowed businesses to achieve the return on investment much quicker. Businesses also attained the security benefits of isolating these services to their isolated operating system instances.
KVM Accelerates Virtualization
Kernel Virtual Machine (KVM) is the implementation of virtualization for Linux-based platforms. KVM became widely successful for a few reasons. First, it took advantage of hardware acceleration in the latest generation processors. That acceleration has been maintained. KVM allowed Linux admins to run a virtual machine, the operating system's isolated instances, with no noticeable performance loss. When bare-metal performance difference is compared between KVM, there is a slight measurable difference (1-2%), but not noticeable to a regular person. The benefits of KVM far outweighed any performance impact as it was negligible. The subsequent significant use of KVM is that it's open-source and accessible. Anyone can take advantage of KVM and learn the technology.
What Is A KVM VPS
Virtual private servers utilizing KVM's hardware-accelerated features on Linux platforms are now the gold standard for virtualization. They have all of the benefits of virtualization, with a negligible performance impact. Since KVM is free, business owners don't need to increase their operating costs. Web hosting companies like ArticHost, take advantage of this technology. All of our virtual servers are accelerated and secured by KVM.
KVM Allows Us To Live Migrate Your VPS
One of the benefits of a KVM VPS is live migration. This feature allows us to move your virtual server between hosts without any downtime. For example, if there are three physical hosts, and host one of them is experiencing performance issues, we can live to migrate your virtual server to host two.
Live migration of your virtual server is accomplished by fulfilling some requirements. First, the network must be configured equally such that once the virtual server is moved, it can still communicate. Second, the storage should be shared so that each physical host can access the virtual server's disks. Finally, the CPU features enabled must be the same on all the physical hosts such that the virtual server does not have to reload.
The process of live migration creates a differencing disk of the RAM used by the virtual server. Then these changes are quickly synced from the source host to the destination host. Any delta changes in the meantime are also synced. Once all of the RAM is synced, the virtual server is paused for 50-200ms such that it can be cut over to the new physical host. Regular users do not notice this pause.
Snapshots can be taken of Your KVM VPS
Since the virtual server's disks are file-based and not actual physical disks, we can take advantage of snapshots. This feature allows us to create a differencing disk of future changes. This means any recent changes after the snapshot are written to the new disk. Having differencing disks will enable you to restore the virtual server's state to the time you took the snapshot. The snapshot feature is a massive advantage for troubleshooting and backing up your virtual server.
Summarizing the benefits of a KVM VPS
The benefits described below are both for the hosting provider and the customer.
Lower cost: Virtualization with KVM allows us to lower costs and quickly attain a return on investment. One server can turn into hundreds if you have enough resources. We pass these savings on to our customers.
Better security: Virtual Private Servers allow us to separate functions or services to multiple, isolated instances of a server to provide better security. Publicly available webservers can be isolated to a separate network and locked down to not infect the rest of the network.
Less Downtime: With virtualization comes the ability to migrate the virtual servers with no downtime. When maintenance is needed on a physical host, we can move the virtual servers to another host through the network. Syncing the RAM and resources means no downtime. The live migration feature allows us to increase our uptime to 99.99% with ease.
Buy Your KVM VPS
ArticHost specializes in only KVM VPS packages. You can trust we do it correctly. Below you will find a selection of our packages separated by their main operating system, Windows or Linux.:
KVM VPS Linux Hosting
KVM VPS Windows Hosting