diff --git a/How-do-Massive-web-Sites-Handle-the-Load-of-Hundreds-of-Thousands-of-Visitors-A-Day%3F.md b/How-do-Massive-web-Sites-Handle-the-Load-of-Hundreds-of-Thousands-of-Visitors-A-Day%3F.md new file mode 100644 index 0000000..60d9e82 --- /dev/null +++ b/How-do-Massive-web-Sites-Handle-the-Load-of-Hundreds-of-Thousands-of-Visitors-A-Day%3F.md @@ -0,0 +1,7 @@ +
One of the surprising issues about Web sites is that, in certain cases, a really small machine can handle a huge number of visitors. For instance, imagine that you've a easy Internet site containing a number of static pages (on this case, "static" means that everybody sees the same version of any page after they view it). Should you took a normal 500MHz Celeron machine operating Home windows NT or Linux, loaded the Apache Web server o­n it, and linked this machine to the Internet with a T3 line (45 million bits per second), you possibly can handle tons of of thousands of holiday makers per day. Many ISPs will rent you a devoted-machine configuration like this for $1,000 or much less monthly. It's good to handle tens of millions of holiday makers per day. The one machine fails (on this case, your site shall be down until a new machine is installed and configured). The pages are extremely large or complicated.
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The pages need to alter dynamically on a per-consumer basis. Any again-finish processing needs to be carried out to create the contents of the page or to course of a request on the page. Since most of the massive Internet sites meet all of those conditions, they need significantly bigger infrastructures. The positioning can distribute the load throughout a number of machines. The positioning can use some combination of the primary two options. Sometimes the site will have an array of stand-alone machines which can be each operating Web server software. All of them have access to an similar copy of the pages for the location. The Domain Name Server (DNS) for the location can distribute the load. DNS is an Internet service that interprets domain names into IP addresses. Every time a request is made for the web server, DNS rotates by the accessible IP addresses in a circular way to share the load.
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The person servers would have widespread entry to the same set of Net pages for the location. Load balancing [switches](https://www.theepochtimes.com/n3/search/?q=switches) can distribute the load. All requests for the online site arrive at a machine that then passes the request to one of the accessible servers. The change can discover out from the servers which one is least loaded, so all of them are doing an equal quantity of work. This is the strategy that HowStuffWorks uses with its servers. The load balancer spreads the load among three completely different Web servers. One of the three can fail with no impact on the location. The benefit of this redundant approach is that the failure of anybody machine doesn't trigger an issue -- the opposite machines decide up the load. It is also easy so as to add capability in an incremental method. The disadvantage is that these machines will nonetheless have to speak to some form of centralized database if there is any transaction processing happening. Microsoft's TerraServer takes the "single large machine" method. Terraserver shops several terabytes of satellite imagery knowledge and handles thousands and thousands of requests for this info. The site uses big enterprise-class machines to handle the load. For instance, a single Digital AlphaServer 8400 used at TerraServer has eight 440 MHz 64-bit processors and 10 GB of error checked and corrected RAM. See the technology description for [Memory Wave clarity support](https://santo.kr:443/bbs/board.php?bo_table=free&wr_id=149902) some really impressive specifications!
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