Number of IIS connections does not equal support for online numbers

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This article I would like to write to IDC friends and buy space friends to see, because there has been a lot of ambiguity and misunderstanding of the place. The point I want to make is that the number of IIS connections written in the configuration of the site space parameters is not the same as the number of concurrent online numbers supported.

I believe that the IDC friends have encountered such a thing, often have customers ask why you say that support IIS connection number 100, and my website online number is not even 100, how often appear inaccessible?

Do IDC friends will usually tell them to support online number is only about half of the IIS connection, get this answer, customers will often feel again met a liar IDC, this is an embarrassing problem after the sale. And then there's the awkward question of pre-sales: There are customers to ask how many online people you support Ah, this time IDC friends may answer, we support the space of IIS 100, support online number of about 50, then the customer will ask, how so little, why everyone said equal to 100? Well, some helpless IDC friends simply started to say that the number of online is 100, but this often will appear just mentioned after the sale of the problem, in short, on the number of IIS connections and online number of people there are many misunderstandings between each other, The lack of knowledge that may come from IDC or the lack of knowledge about patience and customers who buy space.

Below I will explain these questions from the technical principle level.

We all know that there are two popular protocols for network communication, TCP and UDP. TCP is a connection-oriented protocol, the advantages are stable and secure, the disadvantage is to occupy resources, speed general; UDP is a connectionless protocol, with the advantage of being fast and efficient, with the disadvantage that data is easily lost and byte order may be wrong, only for sending small volumes of data. And our client's browser and server-side IIS use of the communication protocol is TCP, because of bandwidth, performance and other objective problems, TCP connections will not be unlimited, so there is a number of support for TCP connections, often the general server between the number of 130,000 connections.

The IIS connection is actually the TCP connection of the IIS software in the server. Here to mention is that there are often IDC to play the number of IIS connections is not limited to the slogan, in fact, this is to a certain extent, the customer's deception, because the total number of IIS connected to a server is limited, The number of IIS connections available IDC may have the following two practices: 1, not to the server in all the different models of the number of IIS connection restrictions, so that different levels of space in the total of 130,000 connections in the number of you fight me, resulting in a constant life-and-death situation, Such a high level of space clients ' interests are virtually violated, because they have more money, but there is no advantage in the scramble for the number of IIS connections, and all the space is the same ability to scramble. IDC's approach is a very irresponsible approach to users. 2, on the surface of the number of IIS connections are not limited to the slogan, secretly to each type of space is limited. This practice so that the users of higher awareness is not at ease, because this is not as good as directly write out the number of IIS restrictions, so that do not know how much IDC to their own limits, but for the low awareness of users, they are complacent, think that picked up a huge cheap, Also often take this to and other specify the IIS connection limit IDC see as price negotiation weight, is for rookie, tragedy tragedy.

Back to the point, we already know that the number of IIS connections is limited on each server, but this limit is determined by the server's hardware configuration and performance and bandwidth. So now we need to know how the browser's IIS connection to the remote server is established. First, when a user opens a browser, enter the address of the site in the address bar, and then connect to the server, start downloading the Web page data, this time set up an IIS connection, and then the user in the page through hyperlinks to open a new page, whether it is a new window or the original window, are working in the same IIS connection. But when the Netizen carries on the following several kinds of actions, will in this Netizen's computer and the server establishes the new IIS connection: 1. The user may be in Baidu search or other sites point to your site, then when he ordered again, this time his computer will be with the server and a new IIS connection. 2. The user may have the habit of using favorites, and when he creates a new page window and then points to your site from the Favorites folder, his computer and the server also have an IIS connection. 3. The user may be from a desktop shortcut to your site, and when he points again the server will create a new IIS connection. Through the above analysis, we can know that it is impossible to do each online user's computer only with the server to establish an IIS connection, often each user on average with the server to establish 2-3 IIS connection, so, through the elementary school math algorithm we will understand, The amount of space saturated online is often less than the number of IIS connection restrictions, as for less, everyone's site is different, because it depends on the popularity of your site and access to traffic and even time to measure, according to my personal experience, online number of people often in the IIS connection limit the number of 1/2+. For example, network technology 1G Korea space, labeled "Concurrent connection Number": IIS300, indicating that support 300 IIS connections, can support the number of online people in general around 150-250.

Hope to do a good job IDC friend to see, so in the work of the customer questioned when it is good to argue, and hope to often buy space webmaster friends also take a serious look, understand this truth, can be less embarrassed some do IDC friend, You know, IDC friends in the current situation and you are also sad.

Article: Arctic/qq:164101724/This paper from: Network Korea Space (http://www.xunns.com)/reprint Please specify the source!