KVM vs VMware vSphere comparison

KVM stands for Kernel-based Virtual Machine, which is an open-source virtualization technology that is embedded in Linux. KVM allows users to seamlessly transform their Linux system into a hypervisor that, in turn, will enable a host machine to run numerous, isolated virtual environments or virtual machines (VMs).

KVM is part of Linux. Users with Linux 2.6.20 or newer already have KVM. As KVM is already a component of the current Linux code, it automatically improves with every new Linux fix, feature, or upgrade. So KVM users are always current and up to date.

KVM automatically transforms Linux to a type -1 (bare-metal) hypervisor. All hypervisors need operating system components, such as a process scheduler, I/O stack, device drivers, memory manager, and more, to run a VM. KVM already has these components embedded, as it is part of the Linux kernel. Each VM is generated as a basic Linux proces,s which is maintained by the standard Linux scheduler, with dedicated hardware such as a graphics adapter, memory, disks, network card, and CPUs.

KVM Key Features:

KVM has many valuable key features. Some of its most useful features include:

• Storage: KVM has the ability to use any storage protocol supported by Linux, including network-attached storage (NAS) and some local disks. Multipath I/O can be utilized to provide redundancy and improve storage. Disk images use thin provisioning, ensuring storage is used on demand. KVM is also able to use shared file systems, enabling VM images to be shared on multiple hosts.
  
• Hardware: KVM is able to use a vast number of Linux-certified supported hardware platforms. As hardware vendors routinely contribute to kernel improvement, the most up-to-date hardware features are generally quickly added to the Linux kernel.
  
• Memory: KVM effectively utilizes the memory management features of Linux, such as kernel same-page emerging and non-uniform memory access. The memory of a VM can easily be switched, supported by large volumes for improved performance, then backed by a disk file or shared.
  
• Migration: KVM actively supports live migration so users have the ability to move any running VM between physical hosts with no downtime.
  
• Security: KVM uses a blend of secure virtualization (SVirt) and security-enhanced Linux (SELinux) for improved VM security and isolation. SELinux determines security boundaries surrounding VMs. sVirt expands SELinux’s processes, permitting Mandatory Access Control (MAC) security to be used for guest VMs and preventing any manual labeling issues.

Reviews from Real Users

“The most helpful aspect of KVM is the fact that the interface is so minimal. It includes just what you need to set up the VMs and manage them, and it's very simple to do so. KVM, as a native virtualization solution, is a complete and fully adequate system for small businesses that need to reduce costs, and also to make maintenance easier. “ - Georges E., Business Engineer and Consultant at All-Tech

“The most valuable feature of KVM is the hypervisor environment and how we can configure it with ease. Additionally, the interface is intuitive.” Sonu S., Senior Solution Architect at Micro Focus

VMware vSphere is a powerful and complete server virtualization platform that allows its users to create and manage virtual data centers and machines. VMware vSphere is designed to help IT departments set up and run applications using the most cost-effective computer resources. By using vSphere, organizations save the time and energy necessary for purchasing infrastructure and software and reduce ongoing maintenance and operational burdens on IT teams.

Infrastructure administrators and network operators can access and manage the vSphere server by using a web-based cross-platform client application or via the vSphere client tool provided with vSphere. 

VMware vSphere provides visibility into VMs and enables its users to carry out operations to manage VMs. This includes tasks such as:

• Powering VMs on and off
• Launching the VM console
• Shutting down guest operating systems
• Settings configurations
• Taking system snapshots

VMware vSphere Benefits

Some of the benefits of using VMware vSphere include: 

• Reduced costs: Since VMware applications are run on a server, it is not necessary to spend large amounts of your organization’s money on hardware, software, and infrastructure.

• Increased productivity and customer satisfaction: VMware is able to operate multiple complex processes simultaneously. With all your applications being managed and run on the cloud, downtime, failures, and application errors are rare. VMware easily scales up and down to meet your computing needs. The high availability that VMware provides allows your IT staff to focus on other issues and keeps your customers satisfied with the service they receive.

• Unlimited access to your VMs: VMware’s user-friendly cloud-based interface allows any employee to work from any location at any time.

• Enhanced security: VMware’s security tools deliver full visibility into your entire system. This keeps your applications and data more secure, in any type of environment. VMware provides multiple protective tools including antiviruses and anti-malware, as well as backup and recovery services.

VMware vSphere Features

Below is a list of some of VMware vSphere’s key features:

• Transferable virtual machine images: Export and import virtual machine images from your local environment. This gives users the ability to set up and configure their systems locally and only upload them to the server once everything is working properly. VM images can be moved back and forth between vendors, ensuring that your company is never tied up to a specific cloud vendor.
  

• User-friendly interface: Using VMware’s intuitive console, you can easily create, manage, share, and deploy virtual machines.
  

• API integration: VMware’s APIs support integration with third-party applications for data protection, multipathing, and disk array solutions.

• Distributed power management: Automate efficiency by continuously optimizing server power consumption within each cluster.

Reviews from Real Users

VMware vSphere stands out among its competitors for a number of reasons. A few major ones are its virtualization abilities, its flexibility and availability, and its user-friendly interface.

Felix D., an Automation project administrator, DCS, I&E at Centennial Cayman Corp, writes, “The connectivity is fantastic, and many functions can run together in one server. If you need to scale, we can continue to add components or modules. It's a beautiful virtual solution that has many advantages over physical hardware, where you have to use devices and wiring to connect all your projects.”