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2025-01-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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KVM and QEMU
QEMU do upper layer virtualization: 1, device driver 2, user space components for analog PC hardware
KVM requires the support of virtualization capabilities in CPU and can only be run on CPU with virtualization support.
VT technology
Physical machine has one process and two modes: user mode and kernel mode.
The virtual machine corresponding to the physical machine is a process, and the virtual machine corresponding to the physical machine has two layers of system calls.
KVM-CPU optimization
CPU cache rating: lscpu
KVM is bound to the virtual machine kernel.
Memory addressing problem
Mapping from memory virtual space to memory physical space.
Directly help the virtual machine to map through the hardware EPT.
KVM Virtualization Features
-in the kernel
-it's a process.
-support for NUMA
-keep open source
After a brief overview, let's start the text now. if the above concepts are not clear, please google to understand the basics of KVM.
A brief introduction, Mr. EC, who has been in the cloud computing circle, is now responsible for the virtualization construction and operation and maintenance of our company.
Now there are about a few hundred virtual machines, but due to the company's business reasons, most of them run oracle databases.
After investigating the major private and public clouds, it is found that the heart of manufacturers is relatively empty for the support of oracle and database.
We might as well respond to the call of the veteran comrades to provide adequate food and clothing by ourselves.
Later articles begin to briefly introduce how KVM is used in small and medium-sized enterprises.
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