Load Balancing

A problematic situation pertaining to difficulty in handling high volumes of incoming traffic can be solved either through installing more RAM on existing machines or replacing the CPU with a faster one. The use of faster or dedicated SCSI controllers and disks with shorter access time can also be done. Software can be tuned so that the operating system parameters and web server software can be adjusted to achieve better performance.

An alternative approach is to improve performance by increasing the number of web servers. This approach would attempt to distribute traffic unto a cluster of back-end web servers that need not be large-scale machines. Web server scalability is achieved when more servers are added to distribute the load among the group of servers or server cluster.

This is what load balancing is all about. It involves the fine tuning of a computer system, network or disk subsystem in order to more evenly distribute the data and/or processing across available resources. Load balancing is distributing, processing and communications activity evenly across a computer network so that no single device is overwhelmed. Busy websites usually use two or more web servers in a load balancing scheme so that when one server gets overwhelmed with requests, traffic is forwarded to another server with more capacity.

There are two probable reasons why a company could want to load balance traffic across firewalls. One is for purely technical reasons and the other is centered on winning business. The technical aspect should be quickly addressed as soon as funds and environment allow.

When there is only one web server responding to all incoming HTTP requests for a website, it may not be able to perform accordingly especially if the website has gained popularity. Loading of web pages will be very slow and some users would have to wait for their requests to be processed. It can come to a point where upgrading the server hardware is no longer cost effective due to the increased traffic and connections to a website.

Yahoo! was granted a patent from a filing done in 1999 regarding coordinating information between multiple servers that share information as well as servers that may cache some of the information. Load balancing devices are becoming very common in supporting high-traffic websites. These devices evolve as websites grow in terms of size, complexity and traffic flow.

The presence of multiple web servers in a server group requires that HTTP traffic be evenly distributed among the servers. These servers should appear as a single web server to the web client. The load balancer simply intercepts each request and redirects it to an available server in the server cluster.

Methods of Load Balancing

Load balancing can be achieved in a number of ways. Choice would depend on the individual requirement, available features, complexity of implementation and the cost. The user company would have to determine its circumstances to determine which option would work best.

The Round Robin DNS Load Balancing is one of the early adapted load balancing techniques. The built-in round robin feature of BIND of a DNS server facilitates cycling through the IP addresses corresponding to a group of servers in a cluster. It is a fairly simple and inexpensive method which is very easy to implement. However, its downside is that the DNS server does not have any knowledge of server availability thus may continually point to an unavailable server. It has the ability to differentiate by IP address but not by server port. There is also the possibility that the IP address is cached by other name servers which would result to request not being sent to the load balancing DNS server.

In Hardware Load Balancing, hardware load balances route TCP/IP packets to various servers in a cluster. This method is said to provide a powerful topology with high availability. It uses circuit level network gateway to route traffic. Its one downside is the higher cost incurred as compared to other methods.

The most commonly used method is Software Load Balancing. Load balancers often come as an integrated component of expensive web server and application server software packages. This method is more configurable based on requirements and can incorporate intelligent routing base on multiple input parameters. An additional hardware needs to be provided to isolate the load balancers.

Algorithm of Server Load Balancing

When HTTP requests are assigned to any server picked randomly among the group of servers, this is called random allocation. It is possible that one server may be assigned more requests than the others, but generally each server gets its share of the load. It can be very easy to implement but the risk of overloading one while under-utilizing another is big.

The IP sprayer assigns the requests to a list of the servers on a rotating basis when the round-robin allocation is used. The first request goes to a randomly picked server in a group so that the entire first request need not go to the same server especially if more than one IP sprayer is involved. The circular order is followed in redirecting the traffic for subsequent requests. The server which has been assigned a request moves to the end of the list to ensure that all servers are equally assigned. The allocation is much orderly than random but it may not be enough based on processing overhead required and when there are differences in server specification in a server group.

The shortcoming of the round-robin allocation has been eliminated by the weighted round-robin version. In this case, a server that is capable of handling twice as much load as the other can get a weight of two. This means that the IP sprayer will assign two requests to the powerful server as against one request assigned to the weaker one. This takes care of the capacity of the servers in the group. However, it does not consider the advanced load balancing requirements like processing time for individual request. An efficient load balancer should be capable of intelligent monitoring that would help it direct requests to the server that is more capable of handling them.

The same telephone service is practically being used both in the homes and in the offices. If you want to reduce the cost of your phone bills, then better utilise the VoIP telephone service. There are lots of things that you should know as you want to enjoy the services and features of this simple solution. Hence, it is only fitting for you to take a close look at its basics.

What is VoIP all about?

VoIP refers to Voice over Internet Protocol. Simply put, it lets you to place a call via a VoIP phone. Your voice is transmitted over the internet rather than making use of the conventional telephone cable lines. When a person talks to you, their voice is also carried in a similar manner. For a broader understanding, VoIP is a type of telephone system connection that utilizes the Internet as the primary means of reaching the other party.

How does VoIP work?

As you contact a person by using a VoIP telephone, your voice signals are changed into the digital signals. They then travel over the internet. For the person on the other line to hear you, the digital signals are then changed back to voice signals.

What main benefits can it provide?

This might sound too good to be true yet you must believe it. A VoIP connection makes use of the high speed Internet, right? Thus, instead of using the regular cable wires, your voice travels via the Internet and you can save a lot of money compared to the costs given by the typical telephone companies in your area. One more thing is that it promotes a secure conversation.

What is meant by packet switching?

Packet switching is the feature that lets the VoIP carry a useful voice data via packet forms. They are transferred one at a time so both parties can hear clear sounds. The useless silent portions are eliminated so that makes the conversation really audible. You will then notice that your talk seems very ordinary. Overall, it lets you save on the bandwidth.

Saving money is one of the main benefits of this telephone service. Even as you place international or long distance calls, you will benefit from the low rates.

Why is it perfect for travellers?

Travelling is not a hassle with the VoIP feature. All that you must bring is your dependable headset and plug in to an Internet connection and there you go in placing your calls. To top it all, you may enjoy the same privilege as you stay in the wireless hot spots.

Furthermore, the VoIP telephone service is something that you should equip your home or business with. There are some downsides for sure but the weight of the positive side is greater. This rationality must be enough to prompt you to avail of it!

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There are a lot of causes to why computers start to run sluggish: computer viruses, not enough computer memory, too many applications (goes along with too little computer memory) or a lot of files. Whatever the cause, something has to be done so you don’t have to work at a snail’s pace.

Behind the scenes in your computer, a lot of things are happening. Whenever you hop on the World Wide Web, your computer is possibly allowing “cookie” files to be stored to retrieve where you have been. We download any and everything from music to videos to eBooks from the World Wide Web. There are temporary files produced for a lot of your downloaded items and they can pile up over time.

Occasionally, the hard drive just needs to be tidied up a bit. With the defrag process, the computer ascertains ways to free up space on your hard drive. This cleaning process ensures optimal performance from your computer when something else is not the problem. Defragmenting your computer is an effective opening move when performance is not at its finest.

If you are having a challenging time navigating the different files on your computer, the real name of the process used to rectify this is “Disk Defragmenter.” You will be able to use your program search bar on the Start Menu to discover it easily. The defragmenter takes fragmented files and consolidates them or removes them altogether depending upon what they are and if they are required.

This is not something that you should to do every day. Remember, we are talking about maintenance here. Executing the operation once a week is good for those who utilise their computer every day and create a lot of documents and files. The neatest thing about Windows is that these maintenance procedures can be set up on a schedule so that they work behind the scenes. Schedule maintenance operations at unusual times like early in the morning or in the middle of the night, when you are not working on your computer in order to keep it from slowing down your personal computer whilst you are attempting to work.

In a nutshell, disk defragmentation is crucial for everybody. Scheduling the procedure allows you to think about other matters. If the defragmentation process does its job, your computer will persist in working well for you with no hitches or glitches.

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For a long time, people did not think of the computer monitor. When the monitor is bright it is easier to see, particularly whilst the surrounding light is low. But, if you have ever considered somebody sitting in a dim lit room looking at a computer monitor, what does it remind you of? That is right – somebody watching television. The only difference is that we are instructed not to sit that close up to a television screen.

No wonder the monitor’s glare impacts on you so! For office workers and home business owners, the computer is a necessity. Whether it is a laptop computer or a personal computer, you rely on it to carry on your business. So, what can you do to end the eyestrain?

Tip #1 – Unplug your laptop computer. When your laptop computer is plugged in, it operates on AC power. The computer monitor is brighter as you work. A good laptop computer battery should run detached of AC power for six or eight hours. Yet a four-hour battery will still serve you well. So, simply unplug. The monitor is now dimmed because it is utilising the battery. Do work in four hour stints and then recharge the battery whilst you perform something else.

Tip #2 – Use lamps and overhead lighting to compensate. If your monitor allows you to adjust the settings, turn them down. A desk lamp can compensate for the low light and help eliminate the eyestrain.

Tip #3 – Invest in a glare filter. For personal computers the filter isbuilte into a square bracket that attaches to the monitor screen. Because lengthy hours are spent working with the computer, your eyes will not become affected and induce headaches. Employing the filter all of the time will benefit everybody who uses the computer.

For laptop computers, glare filters attach on the edges of the screen frame or directly on the screen. They should be removed when you are done working to be able to close the laptop computer. A few glare filters even help with privacy so that nobody can watch what you are doing on your laptop computer unless they are immediately in front of the screen.

Now you do not have to wear your dark glasses inside whilst working on your computer. You are now prepared with something even more beneficial: Three solutions to prevent the headaches and still get your work performed or browse the World Wide Web for fun.

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Brownweb.com.au is a Web hosting company that’s known for speed, reliability and service. They offer a variety of affordable, inexpensive hosting options to meet any company’s or individual’s needs. For more information, visit www.brownweb.com.au for all of you Web hosting,  SEO, IT Support and Computer Hardware needs.

The first matter to think of is although your computer screen or monitor resembles a TV screen, you do not clean it the same way. Spraying Windex upon your screen will create a bigger problem. Computers work hard only they are very delicate. Take the soft approach.

Cleaning the Monitor

Whether a laptop computer or a personal computer, the screen will get dust-covered. You touch it and dare we say, probably have sneezed on it (deadlines still exist even when you are sickly). Over time, all of this dirt builds up on your computer monitor and requires to be cleaned thoroughly.

To ascertain just how dirty your computer is, turn it off and look at the blank screen. Before you cry, take hold of a lint-free cloth. You are able to purchase them at any computer store.

Softly use even pressure as you wipe dirt and dust off of the screen. Be careful, pressing too heavily can damage the components in the screen. This information applies to both laptop computers and personal computers with a newer flat screen.

If the screen is still not clean, you will be able to apply a small amount of cleaner specifically for computer monitors to the screen. Once the heavy grime softens, wipe it off with a lint-free cloth. Commercial cleaners may state that it is harmless for computers but using an approved cleaner is best and won’t leave streaks on your monitor.

Cleaning the Keyboard

The unhealthiest looking place on your computer is the keyboard. Over time, debris, lint, grime, food and other small particles get deposited between keys. Since the keys are so closely located, it is virtually unrealistic to clean between them with a cloth and not pop your keys off.

Alternatively, utilise a can of compressed air to clean your keyboard. Begin at one end of the row of keys and point the spray towards the opposite end to displace all the filth out in one direction. Apply some of the monitor cleaner to wipe skin oils from the top of the keys. Follow all of this up with a computer brush or computer vacuum to remove the last pieces of debris.

Endeavor to do this upkeep on a regular basis. It prevents sticky key situations and you rubbing the screen to remove dirt. Let alone, those filthy germs will no longer lurk and make you ill again! Take care of your computer and it will take care of you.

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Brownweb.com.au is a Web hosting company that’s known for speed, reliability and service. They offer a variety of affordable, inexpensive hosting options to meet any company’s or individual’s needs. For more information, visit www.brownweb.com.au for all of you Web hosting,  SEO, IT Support and Computer Hardware needs.

What is a video card? They are the component responsible for the images that you see on the computer display. The video card is crucial for gamers, graphic artists and the everyday website surfer. Prior to acquiring just the basic video card or the top of the line one, know how to shop for one.

A video card has four common measures for selecting one:

• Cost
• Speed
• Resolution
• Card Slot Type

Video Card and Graphics Card

You may hear people discuss video cards and graphics cards. They are similar in what they do. Video cards are more valuable to gamers. A gamer wants to have the largest amount of memory on their video card so that they can play faster. Certain games consume a lot of space and no one likes to have technical difficulties just as they’re about to slay the giant beast.

Video games have advanced beyond the huge rectangular blip that was the ball in the Atari Ping-Pong game. Resolution is crucial but some gaming worlds are so advanced that faster play is more of the essence.

Graphics cards are sought after more by graphic artists and those using computer-aided design software. Here, attention to detail is crucial in your designs so that’s what will be the primary consideration here. The same goes for the occasional user who surfs the internet.

Types of Video Cards

This depends upon what type of connection you have for a video card. The video card can already be set up to your preference in a new computer. If you assemble computers, this information is useful.

Just so that you recognise, there are 3 different connection types for video cards. The ones that you’ll see in use most frequently these days are AGP and PCI-E. Older connections use a VGA cable.

Cost

Video cards range from reasonably inexpensive to rather expensive. A internet surfer will not want to spend hundreds of dollars on a video card, but a graphic designer may to accommodate their line of work requirements. Cheaper does not imply lower quality, just less bells and whistles. That is all right if you’re not into gaming or computer design.
Not sure what all the letters stand for? Speak to somebody at your local computer shop who can assist you in choosing your video card wisely.

For all your Computer Hardware requirements Brownweb.com.au is a trusted name you can rely on.

Brownweb.com.au is a Web hosting company that’s known for speed, reliability and service. They offer a variety of affordable, inexpensive hosting options to meet any company’s or individual’s needs. For more information, visit www.brownweb.com.au for all of you Web hosting,  SEO, IT Support and Computer Hardware needs.