What Are Load Balanced Systems And What Do They Do
If you happen to make a living off an internet or virtual business then you may be interested in the benefits of having Load Balanced Systems. You may very well be asking what exactly Load Balanced Systems are. In Load Balanced Systems, the most common application is in providing a single internet service from multiple servers. This is known as a server farm. Commonly, Load Balanced Systems may contain popular websites, large chat networks, as well as a host of others services.
For internet usages a software program known as the load balancer, will listen in on the server on a device called a port. This is where someone surfing the web would connect to a server to gain access to a particular service or web page. In the Load Balanced System, the load balancer acts as a buffer taking someone's request and then relaying it to the server. Conversely, the buffer then relays the servers' response to the person trying to access the web. The load balancer operates in complete invisibility and this aids in not allowing a client to access the server directly. If someone where to be able to access the server directly, it could expose the networks internal structure and as a result could open up the possibility to attack on the network or the unrelated services running on other ports. While no system is bulletproof, this feature of Load Balanced Systems does offer a level of security to your network system.
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One major drawback to Load Balanced Systems is what must be done when a backend server requires certain information to be stored on an as needed by the user basis. The problem arises when a backend server needs to access information from a different backend server used earlier. The real downside is performance, and it may suffer greatly if the cached information is not valid for reuse. One solution is, simply send clients to the same backend server. This is known as persistence, but a disadvantage to this is the inability to switch automatically over to a redundant server if one or more backend servers should fail or be taken offline for regular maintenance. Other fixes to this problem is to send clients according to their particular IP address to a specific server. Another alternative is simple allowing all backend servers access as needed by user data.
Load Balanced Systems offer a wide variety of special features including HTTP caching, HTTP compression, spam filtering, and firewall protection just to name a few. With the efficiency, security, and features it is hard to argue against Load Balanced Systems. It is worth looking into if you happen to own a business you care about.
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