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server

2022-07-29 12:49:13   22  举报

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AI智能生成

server

学习笔记

模版推荐

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大纲/内容

reference 

https://www.paessler.com/it-explained/server

types

file servers

store & distribute files

application servers

run application to replace client computers run applications locally 

DNS servers

Domain Name System

translate IP to domain name

mail servers

web servers

database servers

virtual servers

be implemented by software: hypervisor

distribute different virtual servers' requests on real hardware 

proxy servers

monitoring and management servers

work module 

client request data or functionality, the server responds.

tips: a server often perform numerous additional tasks

definition 

a computer or system provides resources, data, services, programs to other computers over a network

structures

rack server

pros

efficiency: highly efficient use of limited data center space, can be easily expanded with additional memory, storage and processors

self-contained: has everything necessary to run as a stand-alone or networked system including CPU, power source, memory. so that rack server can run intensive computing operations 

cost-effective: smaller deployment offer management and energy efficiency at lower cost

cons

power usage: need more cooling units, raising energy cost.

maintenance: Dense racks require more troubleshooting and management time.

blade servers

A blade server is a server enclosure that houses multiple modular circuit boards called server blades.

most only have CPUs, network controllers and memory. Some have internal storage drives.

share switches, ports, power connectors etc.. through chassis

pros

low energy spend

shassis supplies power to multiple blade servers instead of powering and cooling multipe servers in sparate racks

processing power

high processing power. minimal space 

multi-purpose

host primary OS, hypervisor, database and other enterprise-level processes and applications 

availability 

simple ecntralized monitoring and maintenance, load balancing and clustered failover.

cons

upfront costs

initial capital, deployment, configuration costs are high

energy costs

High density blade servers require advanced climate control.

key parameter

U: rack unit

tower server

manufactured with minimal components and software, so mid-size and enterprise customers can heavily customize the servers for specific tasks.

pros

Efficient scalability

Low cooling costs

cons

upgrade expense

large footprint

difference summary 

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Server_Selection_FWK

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分离server

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Server diagram

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on_meta_server_disconnected

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