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Web Hosting - Bandwidth and Server Load, What's That?
Two key performance metrics will impact every web site owner sooner or later: bandwidth and server load.
Bandwidth is the amount of network capacity available, and the term actually covers two different aspects. 'Bandwidth' can mean the measure of network capacity for web traffic back and forth at a given time. Or, it sometimes is used to mean the amount that is allowed for some interval, such as one month. Both are important.
As files are transferred, emails sent and received, and web pages accessed, network bandwidth is being used. If you want to send water through a pipe, you have to have a pipe. Those pipes can vary in size and the amount of water going through them at any time can also vary.
Total monthly bandwidth is a cap that hosting companies place on sites in order to share fairly a limited resource. Companies monitor sites in order to keep one site from accidentally or deliberately consuming all the network capacity. Similar considerations apply to instantaneous bandwidth, though companies usually have such large network 'pipes' that it's much less common for heavy use by one user to be a problem.
Server load is a more generic concept.
It often refers, in more technical discussions, solely to CPU utilization. The CPU (central processing unit) is the component in a computer that processes instructions from programs, ordering memory to be used a certain way, moving files from one place to the next and more.
Every function you perform consumes some CPU and its role is so central (hence the name) that it has come to be used as a synonym for the computer itself. People point to their case and say 'That is the CPU'. But, the computer actually has memory, disk drive(s) and several other features required in order to do its job.
Server load refers, in more general circumstances, to the amount of use of each of those other components in total.
Disk drives can be busy fetching files which they do in pieces, which are then assembled in memory and presented on the monitor, all controlled by instructions managed by the CPU.
Memory capacity is limited. It's often the case that not all programs can use as much as they need at the same time. Special operating system routines control who gets how much, when and for how long, sharing the total 'pool' among competing processes.
So, how 'loaded' the server is at any given time or over time is a matter of how heavily used any one, or all, of these components are.
Why should you care?
Because every web site owner will want to understand why a server becomes slow or unresponsive, and be able to optimize their use of it.
When you share a server with other sites, which is extremely common, the traffic other sites receive creates load on the server that can affect your site. There's a limited amount you can do to influence that situation. But if you're aware of it, you can request the company move you to a less heavily loaded server. Or, if the other site (which you generally have no visibility to) is misbehaving, it's possible to get them moved or banned.
But when you have a dedicated server, you have much more control over load issues. You can optimize your own site's HTML pages and programs, tune a database and carry out other activities that maximize throughput. Your users will see that as quicker page accesses and a more enjoyable user experience.
Web Hosting - DNS, How The Internet Keeps Track of Names The way computers communicate is, in a way, very similar to something very familiar: the postal system that delivers letters and packages. Here's how... The Internet is just what the name suggests, a large inter-connected set of networks. But those networks are pointless without the one part that forms what is called their 'end-nodes', otherwise known as computers. Those computers often need to share information because the people who use them want to share information. But, in a system where there are millions of separate computers, how can you enable them all to communicate? One very important feature of that solution is performed by something called DNS, the Domain Name System. Every part of a network that is going to send or receive information is assigned an IP address. That's a numeric identifier that uniquely specifies a particular 'node', such as a computer, a router that directs traffic or other component. They look like this: 209.131.36.158 But those numbers are more difficult for people to remember and work with. They also aren't very attractive from a marketing perspective. So, a naming system was layered on top of some of them, mostly the computers involved, though routers have names, too. But once you have a system that associates a unique IP address to a given name, you need some way of keeping track of all of them. That's carried out by several different pieces of the system: Name Registrars, DNS Servers and other components. The Name Registrars, overseen by IANA (Internet Assigned Numbers Authority) and other international bodies, provide and keep track of domain names. When you register with GoDaddy or any of a hundred other intermediate companies, ultimately that information makes its way into a number of specialized databases stored inside DNS Servers. A DNS Server is the hardware and/or software that tracks and forwards the IP Address/Domain Name pair from one place to the next. In many cases, there are a number of them between your browser and the remote computer you want to share information with. Suppose you request information from, say, Yahoo's site by clicking on a link on their site. DNS resolves (translates) the name of WHO IS making the request and OF WHOM, to addresses, then passes the request through the network to the requested IP address. The requested data is then passed back through the mesh of network components to your computer and displayed in your browser. Whether the communication is between a desktop computer and a server somewhere, or between one server and another, the process is essentially the same. DNS servers translate names into IP addresses and the requests for data are forwarded on. In some cases those DNS servers are part of a specialized network computer whose sole job is to do the translation and forwarding. In other cases the DNS software may reside on a server that also houses a database of general data, or stores email, or performs other functions. But however complicated the chain or the parts, the basic process is simple. Translate the name to an address, just as the postal system does. Whether international or local, your name is associated with an address, and the deliveries are made to the address, then forwarded to a particular name. Great Free Gift Idea – How to Get Official Presidential Greetings for a Loved One Are you ready for the most official gift idea ever proposed? Do you know someone who enjoys collecting authentic autographs and memorabilia? Or perhaps you know someone who has a good sense of humor and enjoys a gag gift on those special occasions? If this is the case, you may be interested in a great free gift idea—procuring an official presidential greeting for a loved one. Here is the run-down on how you can get a hold of this awesome gift idea. Believe it or not, getting an official presidential greeting is easier than you might think. Did You Know that the White House Offers Free Greetings? It is true—the White house offers free greetings for those very special occasions. These free greetings are official and recognized by the White House and the Office of the President. However, you should know that there are numerous restrictions to procuring these free presidential greetings. Unfortunately, the White House is not currently able to fulfill all the requests for official presidential greetings at this time. However, if you are truly interested in landing a free and very official presidential greeting for a loved one, it is worth giving it a try. As the old saying goes, nothing ventured, nothing gained. How to Make Your Request for an Official Presidential Greeting How can you go about making an official request for an official presidential greeting? There are several ways you can request a presidential greeting directly from the White House. There are several ways to make your official request. There are three basic routes for requesting an official presidential greeting from the White House. You can make your official request for a presidential greeting through fax, by postal mail, or by filling out an online email form. Although no one method appears to be considerable more effective than any other, some successful recipients of an official presidential greeting swear that you are more likely to receive a response if you put in your official request through postal mail or fax. However, this may just be a hunch, because it seems that it may seem harder to ignore a written request rather than a virtual email request. As with anything important, you will want to make your request for an official presidential greeting way ahead of time. For instance, if you want to request an official presidential wedding greeting, you will want to make your request well ahead of time. What Kind of Official Presidential Greetings is You Allowed to Request? Although there is no set guideline about what kind of greetings you can request, there are many standard issue presidential greetings. These include birthday greetings, 50th wedding anniversary and higher, births, Bar Mitzvahs, Bat Mitzvahs, weddings, scouting awards and others. Official Guidelines for Requesting Your Greetings For the official guidelines on how to request official presidential greetings from the White House, check out the official White House website. There you will find the official guidelines on how to request greetings from the White House, as well as how to extend an official invitation to the White House. In general, here are some things to keep in mind. The White House will only send out official greetings to U.S. citizens. You must provide the following information: name of the honoree, address of the honoree, form of address, date of birth, birthday, wedding or anniversary, and the requestor's name and daytime phone number. Be aware that the numbers of requests you can make are limited on a per day basis. Requests for multiple institutional requests must be make by fax or mail on official letterhead. When can you expect your official presidential greeting? In general, greetings will be mailed in approximately 14 days prior to the event that is being recognized by the greeting. |