A high-volume site like Yahoo! knows that the actual quality of service any web server provides to end users basically depends on network transfer speed and server response time. Network transfer speed means internet connection bandwidth while server response time depends on resources including faster CPU, more RAM and better I / O performance. When these resources are depleted and the web server encounters heavy traffic, a problem will inevitably arise.
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A problematic situation related to the difficulty of managing large amounts of incoming traffic can be solved by adding more RAM to existing equipment or by replacing the faster CPU. The use of fast or dedicated SCSI controls and disks with short access time can also be done. Software can be configured to optimize operating system parameters and web server software to improve performance.
Another way to improve performance is by increasing the number of web servers. This method may attempt to distribute traffic to a collection of web servers that do not require large machines. Web server balancing is achieved when additional servers are added to distribute the load between a group of servers or a group of servers.
This is what the load rating means. Includes proper configuration of a computer system, network or disk system to evenly distribute data and / or processing across all available resources. Load balancing is distributed, processed and evenly connected to a computer network so that no single device is fully charged. Busy websites usually use two or more web servers in the load balancing scheme so that when one server is overwhelmed by requests, the traffic is transferred to another server with additional capacity.
There are two possible reasons why a company might want to load balance traffic into firewalls. One is for technical reasons only and the other is for business. The technical aspect should be resolved as soon as the funds and space are available.
If there is only one web server that responds to all incoming HTTP requests for a website, it may not be able to function properly especially once the website has gained popularity. Uploading web pages will be very slow and some users will have to wait for their requests to be processed. It may come to a point where upgrading server hardware is less expensive due to increased traffic and website connectivity.
Yahoo! has been granted a patent since the completion of 1999 regarding the connection between information sharing servers and servers that may store certain information. Load machines are very common in supporting high-traffic websites. These devices change as websites grow in size, complexity and traffic flow.
The presence of multiple web servers in a server group requires that HTTP traffic be evenly distributed between servers. These servers must appear as a single web server for the web client. The load rating simply captures each request and redirects it to the server available in the server component.
Loads Measurement Methods
Balancing the load can be achieved in many ways. The choice will depend on the individual schedule, the features available, the difficulty of use and the cost. The user company will need to determine their own circumstances in order to determine which option works best for them.
Round Robin DNS Load Balancing is one of the most common load balancing methods. The robin round feature of BIND DNS server DNS helps cycling with IP addresses associated with a group of servers in the collection. It is a simple and inexpensive method that is very easy to use. However, the downside is that the DNS server does not have server availability information so it may continue to identify the server which is not available. It has the ability to distinguish by IP address but not by server port. It is also possible that the domain address is cached by some domain name servers which could result in the request being sent to a DNS load server.
In Hardware Load Balancing, hardware load balances TCP / IP packets on various servers in the collection. This method is said to provide strong topology with high availability. Uses regional-level network gateway for route traffic. Its other disadvantage is the high cost incurred compared to other methods.
The most widely used software is Software Load Balancing. Load ratings often come as an integrated component of expensive web server and software server software packages. This method is highly customizable based on requirements and can include a smart track base for multiple input parameters. Additional hardware needs to be provided to separate load balances.
Server uploading algorithm
When HTTP requests are delivered to any randomly selected server within a group of servers, this is called random distribution. It is possible that one server may receive more requests than others, but usually each server receives its own load share. It can be very easy to use but the risk of overloading one while using the other is a bit high.
IP spray provides applications to list servers around when using a round robin allocation. The first request will be to a randomly selected group in the group so that every initial request will not go to the same server especially if more than one IP server is involved. A circular order is followed to redirect traffic to the following applications. The server assigned to the application goes to the end of the list to ensure that all servers are shared equally. Offers are more organized than random but may not be enough based on the high processing required and where there is a difference in server specification in the server group.
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