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Web Hosting - Redundancy and Failover
Among the more useful innovations in computing, actually invented decades ago, are the twin ideas of redundancy and failover. These fancy words name very common sense concepts. When one computer (or part) fails, switch to another. Doing that seamlessly and quickly versus slowly with disruption defines one difference between good hosting and bad.
Network redundancy is the most widely used example. The Internet is just that, an inter-connected set of networks. Between and within networks are paths that make possible page requests, file transfers and data movement from one spot (called a 'node') to the next. If you have two or more paths between a user's computer and the server, one becoming unavailable is not much of a problem. Closing one street is not so bad, if you can drive down another just as easily.
Of course, there's the catch: 'just as easily'. When one path fails, the total load (the amount of data requested and by how many within what time frame) doesn't change. Now the same number of 'cars' are using fewer 'roads'. That can lead to traffic jams.
A very different, but related, phenomenon occurs when there suddenly become more 'cars', as happens in a massively widespread virus attack, for example. Then, a large number of useless and destructive programs are running around flooding the network. Making the situation worse, at a certain point, parts of the networks may shut down to prevent further spread, producing more 'cars' on now-fewer 'roads'.
A related form of redundancy and failover can be carried out with servers, which are in essence the 'end-nodes' of a network path.
Servers can fail because of a hard drive failure, motherboard overheating, memory malfunction, operating system bug, web server software overload or any of a hundred other causes. Whatever the cause, when two or more servers are configured so that another can take up the slack from one that's failed, that is redundancy.
That is more difficult to achieve than network redundancy, but it is still very common. Not as common as it should be, since many times a failed server is just re-booted or replaced or repaired with another piece of hardware. But, more sophisticated web hosting companies will have such redundancy in place.
And that's one lesson for anyone considering which web hosting company may offer superior service over another (similarly priced) company. Look at which company can offer competent assistance when things fail, as they always do sooner or later.
One company may have a habit of simply re-booting. Others may have redundant disk arrays. Hardware containing multiple disk drives to which the server has access allows for one or more drives to fail without bringing the system down. The failed drive is replaced and no one but the administrator is even aware there was a problem.
Still other companies may have still more sophisticated systems in place. Failover servers that take up the load of a crashed computer, without the end-user seeing anything are possible. In fact, in better installations, they're the norm. When they're in place, the user has at most only to refresh his or her browser and, bingo, everything is fine.
The more a web site owner knows about redundancy and failover, the better he or she can understand why things go wrong, and what options are available when they do. That knowledge can lead to better choices for a better web site experience.
Beautiful Pens are Just the Beginning: Fascinating Gifts for Writers (gifts for writers) Buying gifts is a difficult project in many cases. Sometimes a person seems to already have everything. They may not enjoy the typical gift ideas that come to your mind. To buy the perfect gift, it is essential to actually know a person. A basic understanding of likes and dislikes will help, but passions will guide you to a really great gift. If you cannot come to a conclusion for what to buy for a friend, you can also consult other sources for gift ideas. Following are some ideas for buying gifts for writers. Writers are passionate people. They are passionate about words and about truth. They are also passionate about their subject matter. Is there a writer in your life? By using these guidelines, along with your knowledge about that person, you can come up with an ideal gift that they will treasure. Under Twenty Dollars As suggested by the title, a beautiful pen is almost always an inexpensive and appropriate gift for a writer. Most writers spend much of their time jotting down thoughts and ideas. As they meander through their day, an idea may strike at any time. Give them a quality instrument to facilitate great thoughts. You can also include a personalized pad of paper to hold on to the brainstorms. Another great gift for a writer is a magazine subscription. A good writer needs to keep up with the type of writing that is being published. Sometimes they need a little bit of light reading to keep their creative juices flowing. Choose the magazine based on some interest that you and your friend share. Under One Hundred Dollars If you want to spend a little bit more on gifts for writers, you can start taking your gift buying to a little bit different level. For less than one hundred dollars your options open up. Books are great gifts for writers. You can buy new books in the writer’s area of interest or expertise. He will probably always be ready to expand his own knowledge base. You can also buy reference books. Style manuals are very helpful when a writer has strict guidelines to follow. Your writing friend probably already has a pretty good dictionary, but you can buy them the best one. Thesauruses and literary guides are also interesting gifts to receive. Moving away from words for a bit, a writer would also love to receive an artifact that has to do with their main subject matter. If he is a history buff, try to find an authentic coin from the particular piece of history he finds most fascinating. Under Five Hundred Dollars At the next level of gift buying, your options start expanding into more elaborate forms of previous gifts. Very old and rare books may fall into this price range. Very old or particularly good quality antiques will also be fairly expensive. Gifts for writers also often fall into the category of electronics. Good printers make the writing all that more impressive looking on the page. Software and other hardware for the computer is also a worthwhile gift for a writer that spends most of his day sitting at his computer. A nice digital camera is also a fantastic gift for a writer that wants to remember situations exactly in order to adequately describe them later. Won’t Cost you A Dime Some of the best gifts for writers won’t cost you anything. Many of the more expensive gifts are extremely practical, but the free ones can be that also. The nature of a writing career leads writers to spend a lot of time alone. A good gift is just some company. Take your friend out for dinner with a group of mutual friends. He’ll appreciate the time away from the desk. If he’s been trying to get an interview with someone, you can put the leg work in for him and schedule it. All that will cost you is some time and effort. Not all gifts have to cost money. Good luck finding the perfect one for the writer in your life. Clean Up your Digital Profile and Land that Job Whether you are looking for a job after getting fired or you are looking for a job other than the one you are working at currently, many steps in that process are the same. You need to get your résumé up to date and conform to newest standards, you need to get your wardrobe together and most of all you need to be prepared to go for the interview. But did you know that in a fast paced society with all the high technology gadgets, employers and companies appreciate a good digital profile? When it is time to land a new job it is time for you to clean up your digital profile. For those of you who might not know what a digital profile is, let’s reminisce about digital profiles for just a second here. A digital profile is any and all information about you that can be found online. It can be anything from your own homepage, over articles and answers that you have posted on the Internet to videos and pictures of you. Anything that is somehow connected to you and your name and can be found through Internet search engines such as Google, Yahoo and other crawlers belongs to your digital profile or e-portfolio. Believe it or not, many employers have started to check out your digital profile online by doing a little research on the Internet and finding any information about you. If it is on the Internet it is public information and therefore not illegal. Information on the Internet does not necessarily have to be positive. What if one of your friends posted some stories or pictures/movies about you on the Internet? Employers might see that and think that you are not fir for the tasks that are asked form you by the new job and might just plain throw your nice résumé into the trash before they ever have a chance to meet you in person. Therefore before going onto your next job-hunt, clean up your digital profile. Steps you can take to clean up your e-profile are many and one of the easiest ones is a regular search with different Internet search engines about things that are related to your name. See what comes up and try to clean it up. If there are pictures or movies posted on such pages as u-tube about you, try to get friends or the owners of the page to take them down or at least take your name of the page in such a way that a search engine cannot find this information when somebody is searching for your name. A very important positive step in cleaning up your digital profile is to create your own positive statements and information on the Internet, such as online résumé, Personal web pages or a personal development plan (PDP). If the amount of positive information, academic achievements, and plans for the future are greater than any negative amount of information they can find, the light shed on you is of good nature and your chances are greater to land that job than when they only find negative information for the reasons that you never knew about a digital profile. Should you still be new to all of this and you are not quite as well versed on the Internet, there are places that can help you. Many Universities and development centers offer help and tools just for this kind of situation. Public libraries also offer you free time on the Internet as well as other resources in connection with the job-hunt and digital profiles. So before you actually send out your résumé, make sure that you checked online for any information that might harm you. |