Sunday, October 6, 2013

Tier dalam data center / ruang server



Data center tiers[edit]

The Telecommunications Industry Association is a trade association accredited by ANSI (American National Standards Institute). In 2005 it published ANSI/TIA-942, Telecommunications Infrastructure Standard for Data Centers, which defined four levels (called tiers) of data centers in a thorough, quantifiable manner. TIA-942 was amended in 2008 and again in 2010. TIA-942:Data Center Standards Overview describes the requirements for the data center infrastructure. The simplest is a Tier 1 data center, which is basically aserver room, following basic guidelines for the installation of computer systems. The most stringent level is a Tier 4 data center, which is designed to host mission critical computer systems, with fully redundant subsystems and compartmentalized security zones controlled bybiometric access controls methods. Another consideration is the placement of the data center in a subterranean context, for data security as well as environmental considerations such as cooling requirements.[16]
The German Datacenter star audit program uses an auditing process to certify 5 levels of "gratification" that affect Data Center criticality.
Independent from the ANSI/TIA-942 standard, the Uptime Institute, a think tank and professional-services organization based in Santa FeNew Mexico, has defined its own four levels. The levels describe the availability of data from the hardware at a location. The higher the tier, the greater the availability. The levels are: [17] [18]
Tier LevelRequirements
1
  • Single non-redundant distribution path serving the IT equipment
  • Non-redundant capacity components
  • Basic site infrastructure with expected availability of 99.671%
2
  • Meets or exceeds all Tier 1 requirements
  • Redundant site infrastructure capacity components with expected availability of 99.741%
3
  • Meets or exceeds all Tier 1 and Tier 2 requirements
  • Multiple independent distribution paths serving the IT equipment
  • All IT equipment must be dual-powered and fully compatible with the topology of a site's architecture
  • Concurrently maintainable site infrastructure with expected availability of 99.982%
4
  • Meets or exceeds all Tier 1, Tier 2 and Tier 3 requirements
  • All cooling equipment is independently dual-powered, including chillers and heating, ventilating and air-conditioning (HVAC) systems
  • Fault-tolerant site infrastructure with electrical power storage and distribution facilities with expected availability of 99.995%
The difference between 99.671%, 99.741%, 99.982%, and 99.995%, while seemingly nominal, could be significant depending on the application.
Whilst no down-time is ideal, the tier system allows the below durations for services to be unavailable within one year (525,600 minutes):
  • Tier 1 (99.671%) status would allow 1729.224 minutes
  • Tier 2 (99.741%) status would allow 1361.304 minutes
  • Tier 3 (99.982%) status would allow 94.608 minutes
  • Tier 4 (99.995%) status would allow 26.28 minutes

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