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Hardware and virtualization :
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Physical machine : Traditional physical servers are actual hardware devices, usually without virtualization technology. Each physical server is independent and does not share resources with other servers. -
Bare metal server : Although it is also based on physical hardware, the bare metal server uses virtualization technology. However, unlike traditional virtual machines, bare metal servers provide performance close to physical machines, while maintaining some advantages of cloud services, such as automatic distribution, automatic operation and maintenance.
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Performance and predictability :
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Physical machine : Since the overhead of the virtualization layer is not involved, the physical machine can usually provide higher performance and more predictable performance. -
Bare metal server : Since there is no overhead of virtualization layer, bare metal server also provides high performance and predictability.
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Flexibility and management :
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Physical machine : Physical machines usually need more management work, including hardware and operating system management. However, they also provide more flexibility, because you can freely configure hardware and operating systems as needed. -
Bare metal server : The bare metal server provides cloud services such as automatic distribution and automatic operation and maintenance, reducing management complexity. However, their configuration is usually static, requiring you to manage the hardware and operating system yourself.
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Security and isolation :
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Physical machine : The physical machine provides physical level isolation and high security. -
Bare metal server : The bare metal server also provides physical isolation from other tenants to ensure security.
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Application scenarios :
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Physical machine : Applicable to scenarios requiring high performance, hardware control and predictability, such as large computing tasks or specific hardware configuration requirements. -
Bare metal server : It is applicable to scenarios that require high performance and stability. At the same time, it hopes to enjoy some advantages of cloud services, such as automatic distribution, automatic operation and maintenance.