How do important net websites cope with hundreds of visitors a day?


One of the surprising factors about Web 메이저사이트sites is that, in top-notch cases, a completely small device can cope with a large fashion of visitors. For example, do not forget that you have a smooth Web Page containing a few static pages, in this case, the “static” technique is that everybody sees the equal version of any net internet net web page when they view it).

If you took a normal 500MHz Celeron device strolling Windows NT or Linux, loaded the Apache Web server o­n it, and associated this device to the Internet with a T3 line, you may cope with hundreds of hundreds of visitors regular the day. Many ISPs will lease you for a dedicated-device configuration like this for $1,000 or an awful lot an entire lot much less in steps in step with the month. This configuration will artwork super unless.

You need to cope with tens of hundreds and hundreds of visitors regularly with the day. The single device fails. The pages are substantially large or complicated. The pages need to extrude dynamically on a regular with-patron basis. Any back-save you processing desires to be executed to create the contents of the net internet net web page or to make a request on the net internet net web page. Since most of the large 메이저사이트 net websites meet all of these conditions, they need drastically large infrastructures.

The incoming requests for pages are unfolded out during all of the machines in reality taken into consideration simply considered one in every of ways:

  • The Domain Name Server (DNS) for the net web website online can distribute the load. DNS is an Internet issuer that translates domain names into IP addresses. Each time a request is made for the Web server, DNS rotates via the available IP addresses roundly to percentage the load. The person servers would possibly no longer have an uncommon vicinity get right of get entry to the equal set of Web pages for the net web website online.
  • Load balancing switches can distribute the load. All requests for the Web net web page arrive at a device that then passes the request to at least one in every one of the available servers. The switch can find out from the servers which one is least loaded, so all of them are doing an equal amount of artwork. The load balancer spreads the load among three one-of-a-kind Web servers. One of the three can fail without an effect on the net web website online.
  • The benefit of this redundant approach is that the failure of every person’s device does not motivate a problem; the possibility machines choose out the load. It is also easy to function capability incrementally. The drawback is that the machines will, despite the reality that they have got to talk to a few sorts of centralized databases if there can be any transaction processing going on.

Microsoft’s TerraServer takes the “single large device” approach. TerraServer ships several terabytes of satellite tv for pc to computer tv for the computer to for computer imagery facts and handles tens of hundreds and hundreds of requests for those facts. The net web website online uses large enterprise-beauty machines to cope with the load. For example, a single Digital Alpha Server 8400 used at TerraServer has eight 440 MHz 64-bit processors and 10 GB of checked and corrected RAM. See the generation description for some super specifications.

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