How Multiple Server Hosting impacts your website's uptime

Written by Godfrey Heron

Continued from page 1

However,repparttar round robin DNS strategy solves this predicament, by mapping your domain name to more than one IP address.

Select hosting companies now employrepparttar 134395 DNS round robin technique in conjunction with'failover monitoring'.

The DNS round robin failover monitoring process starts by a web hosting company setting up your site on two or more independent web servers (preferably with different IP blocks assigned to them). Your domain name will therefore have 2 or more IP Addresses assigned to it.

Thenrepparttar 134396 failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text inrepparttar 134397 results. Whenrepparttar 134398 system detects that one of your IP addresses is returning an error, andrepparttar 134399 others aren't, it pulls that IP address out ofrepparttar 134400 list. The DNS then points your domain name torepparttar 134401 working IP address/s

If any of your IP's come back online they are restored torepparttar 134402 IP pool. This effectively and safely keeps your site online even if one of your web servers is down.

The average failure detection and recovery time with a system like this can be as low as 15 minutes. This time varies depending onrepparttar 134403 speed of your site andrepparttar 134404 nature ofrepparttar 134405 failure and also how long other ISP's cache (save) your DNS information.

The time taken for other ISP's caching your information can be manipulated inrepparttar 134406 failover monitor by loweringrepparttar 134407 "time to live" (TTL) cache settings. These arerepparttar 134408 settings that other ISP's will use to determine how long to cache your DNS information.

Of course you must bear in mindrepparttar 134409 matter of how frequently data is synchronized between your website's servers. This will berepparttar 134410 hosting company's responsibility, and this may become complicated where databases and user sessions are involved.

The very expensive hardware based failover monitoring systems that point a virtual IP address to other ISP's, while behindrepparttar 134411 scenes juggling a number of unique IP addresses on different servers, is of courserepparttar 134412 most 'elegant' solution to multi server hosting.

That way,repparttar 134413 whole issue of ISP's caching your information does not come into play.

Therefore, for site's that need to have true 99.99995% uptime, without huge outlays of money,repparttar 134414 technology is readily available and certain proprietory failure monitoring systems are now relatively cheap to apply.

Godfrey Heron is the Website Manager of the Irieisle Multiple Domain Hosting Services company.Signup for your free trial, and host multiple web sites on one account:

How to Choose a Reliable Web Host ?

Written by Maria

Continued from page 1

Mailing Lists A mailing list is a discussion group that is email-based. They are useful as a promotional tool. You can also use a mailing-list program to distribute your ezine.

FTP (File Transfer Protocol) It allows you to transfer files to and from your Web site quickly and easily. This service should be provided. Only some free web hosting services don't offer FTP. I would be really be worried if a web hosting service doesn't offer this basic service.

Anonymous FTP Accounts This function allows you to set up an FTP site that people can access to download files. If you are distributing software or giving away free ebooks, this is a great tool. You can also have files transfered directly from your Web site, but it's sometimes handy to have an FTP site as well. FTP sites can resume interrupted downloads. If someone is transfering a file, and their ISP or phone company cuts them off half way through, they can come back and continuerepparttar transfer where they left of. This works great for large downloads.

A Secure Server - Referred To As SSL Server This is a must if you plan to take orders online or transfer sensitive information. The secure server allows redit-card information typed into a form to be encrypted before being sent fromrepparttar 134394 user's Web browser torepparttar 134395 server. You may have to pay an additional fee to userepparttar 134396 secure server. You don't have to have a secure server to take orders online, but you may lose a lot of orders if you don't provide this for your customers.

CGI Scripts You can use CGI to take information from a form and send it to your email account and some shopping cart programs use it as well. A good Web hosting service will have a library of CGI scripts you can use. Find out if you can add your own CGI scripts. Don't get a service that won't allow you to do this. You may regret it inrepparttar 134397 future even if you don't use them now.

Advanced Features Does The Web Host Provide Advanced Features Such As Database Access, Java Applets, RealAudio/Video, PHP,Password Protection...etc If You Need Them !?

Backups A good web host will backup your web directory daily. This is pretty standard throughoutrepparttar 134398 industry. If a web host doesn't provide this service, don't even consider using them. Some web hosts will even do redundant backups to insure your web site is not lost.

A Guarantee With so many web hosting services out there, make sure you choose one that offers a guarantee. Services that offer a moneyback guarantee are confident that you'll be satisfied with their service. Look for at least a basic 30 day money back guarantee.

Flexibility The ideal web hosting service will have lots of options and upgrades to accomodate future growth of your web site. You may need to add ecommerce to your web site (shopping cart, storefront, merchant account), or more web space, a forum, or you might just need to have your own dedicated server. A good web hosting company will have all these resources available to you if you need them.

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