Kernel-based Virtual Machine (KVM) vs. Oracle Virtualization

KVM is the best solution in the case you need to test and turn up any virtual environment with limited vCPU/RAM resources. The obvious area of its use is a network environment when we want to avoid being tied to one type of hardware/vendor and being able to swap from one instance to another with no downtimes. The use of a vSwitch (that supports VLAN tagging) is a significant bonus for network engineers that some other hypervisors do not provide.

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Well suited: development work as they provide a very nice free tier, datacenters in Latin America with very low ping, heavy loads for DB if you use Oracle DB Less appropriate: fast webservers as they use hard disks for several tiers, fast MySQL databases as the server is shared, auto-scaling functionality is not present.

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• KVM is really good at providing fast and reliable virtualization for Linux guests
• Since KVM is a kernel module, every VM is a Linux process which can be managed by Linux system tools
• KVM integrates very well with the management framework libvirt, which is why KVM can be integrated in automation tools as well

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• Installation and setup of VM Server are pretty straight forward.
• Many different guest operating systems are supported.
• There can be up to 128 virtual machines per physical server.

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• KVM itself doesn't ship with a management interface
• KVM itself is a bit complicated to handle
• KVM needs Qemu to virtualize Windows guests

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• Platform designer
• Support material

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It does the job and stays out of the way. The specifics of usability relies on the implementation, but with things like Icarus and libvirt, things are standardizing nicely.

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It is a very reliable solution that can be used for x86 architecture virtualization with low overhead. It is a free and open source software. Easy to use withOpenStack.

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• Fast provisioning of new servers.
• Huge drop of the cost of servers compared to bare metal.
• Easy upgrades of resources, sometimes now even requiring a server restart.

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• Saved us licenses fees while we upgrade to a virtual environment and redundancies servers
• Forced me to manage another hard to manage virtual environment

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