server
2022-07-29 12:49:13 22 举报AI智能生成
server
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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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