Casual Articles - How Multiple Server Hosting impacts your website's uptime

Hosting of web sites has essentially become a commodity. There is very little distinguishing one hosting company from the next. Core plans and features are the same and price is no longer a true determining feature. In fact, choosing a host based on the cheapest price can be more expensive in the long term with respect to reliability issues and possible loss of sales as a result of website downtime.

Selecting a host from the thousands of providers and resellers can be a very daunting task, which may result in a hit and miss approach. But although hosting may have become a commodity, one distinguishing feature that you must always look out for is reliability.

At the heart of any hosting company's reliability is redundancy. This ensures that if a problem exists at one point, there will be an alternative which ensures continuity as seemlessly and transparently as possible.

Most hosts do employ redundant network connections. These are the high speed pipes that route data from the server to your web browser. But, redundant 'multiple web servers' have been extremely rare and very expensive, requiring costly routing equipment which has previously been used only in mission critical applications of Fortune 500 companies.

However, a very neat but little known Domain Name Server(DNS) feature called 'round robin' allows the selection and provision of a particular IP address from a 'pool' of addresses when a DNS request arrives.

To understand what this has to do with server reliability it's important to remember that the Domain Name Server (DNS) database maps a host name to their IP address. So instead of using a hard to remember series of numbers (IP address) we just type in your web browser www.yourdomain.com, to get to your website.

Now, typically it takes at at least 2 to 3 days to propagate or ‘spread the word’ of your DNS info throughout the internet. That's why when you register or transfer a domain name it isn't immediately available to the person browsing the web.

This delay has stymied the security benefits of hosting your site on multiple servers, as your site would be down for a couple of days if something went awry with one server. You would have to change your DNS to reflect your second server and wait days before the change was picked up in routers on the internet.

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

Select hosting companies now employ the 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.

Then the failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text in the results. When the system detects that one of your IP addresses is returning an error, and the others aren't, it pulls that IP address out of the list. The DNS then points your domain name to the working IP address/s

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

Successful Ebay Sellers' Pros And Cons
Firstly you must be wondering who I am and how my advise can be credible, Well lets say I've been there got the T shirt and some and that my credentials are Seller SJACOBS3 View my about me page and the link will take you back to my website j-lou.com I was a power seller from 2001-2007 and was featured for ebay in the daily Mirror to help ebay with its U.K promotion & Represented them for promotion of businesses using ebay as a selling tool.So you want to be a successful Ebay Business.I always called it the 3 p's "Product-Presentation-Price" get this part right and you are on youing may have become a commodity, one distinguishing feature that you must always look out for is reliability.

At the heart of any hosting company's reliability is redundancy. This ensures that if a problem exists at one point, there will be an alternative which ensures continuity as seemlessly and transparently as possible.

Most hosts do employ redundant network connections. These are the high speed pipes that route data from the server to your web browser. But, redundant 'multiple web servers' have been extremely rare and very expensive, requiring costly routing equipment which has previously been used only in mission critical applications of Fortune 500 companies.

However, a very neat but little known Domain Name Server(DNS) feature called 'round robin' allows the selection and provision of a particular IP address from a 'pool' of addresses when a DNS request arrives.

To understand what this has to do with server reliability it's important to remember that the Domain Name Server (DNS) database maps a host name to their IP address. So instead of using a hard to remember series of numbers (IP address) we just type in your web browser www.yourdomain.com, to get to your website.

Now, typically it takes at at least 2 to 3 days to propagate or ‘spread the word’ of your DNS info throughout the internet. That's why when you register or transfer a domain name it isn't immediately available to the person browsing the web.

This delay has stymied the security benefits of hosting your site on multiple servers, as your site would be down for a couple of days if something went awry with one server. You would have to change your DNS to reflect your second server and wait days before the change was picked up in routers on the internet.

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

Select hosting companies now employ the 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.

Then the failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text in the results. When the system detects that one of your IP addresses is returning an error, and the others aren't, it pulls that IP address out of the list. The DNS then points your domain name to the working IP address/s

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

The Difference Between 'Work At Home' Scams And Legitimate Opportunities
Everyone is aware of scams all over the Internet. In fact, many have become so sceptical that they turn away any money-making opportunity they come across. Without a doubt, these scams are given real businesses and the online marketing community in general a bad name.Go to a job site or a classified section, search for 'data entry' and you will see some home typing jobs and data entry at home opportunities. Are these real?Let me tell you straight off - they are not!Once you send in your resume (as if it was needed) to these opportunities, they will reply you with a link to their webneat but little known Domain Name Server(DNS) feature called 'round robin' allows the selection and provision of a particular IP address from a 'pool' of addresses when a DNS request arrives.

To understand what this has to do with server reliability it's important to remember that the Domain Name Server (DNS) database maps a host name to their IP address. So instead of using a hard to remember series of numbers (IP address) we just type in your web browser www.yourdomain.com, to get to your website.

Now, typically it takes at at least 2 to 3 days to propagate or ‘spread the word’ of your DNS info throughout the internet. That's why when you register or transfer a domain name it isn't immediately available to the person browsing the web.

This delay has stymied the security benefits of hosting your site on multiple servers, as your site would be down for a couple of days if something went awry with one server. You would have to change your DNS to reflect your second server and wait days before the change was picked up in routers on the internet.

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

Select hosting companies now employ the 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.

Then the failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text in the results. When the system detects that one of your IP addresses is returning an error, and the others aren't, it pulls that IP address out of the list. The DNS then points your domain name to the working IP address/s

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

Choosing Networking Functions
Time is a concern for all of us. We only have so much of it to give to our work, and then some to our families, our churches and some to ourselves. In today's business climate it is essential to spent our time wisely to maximize our productivity and satisfaction with our lives.One way that you can ascertain that the time you spend networking is most effective for you and the accomplishment of your goals is to choose your functions for networking strategically. This involves deciding on goals for your networking time and then seeking groups and functions that are geared toward the satisfaction of diately available to the person browsing the web.

This delay has stymied the security benefits of hosting your site on multiple servers, as your site would be down for a couple of days if something went awry with one server. You would have to change your DNS to reflect your second server and wait days before the change was picked up in routers on the internet.

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

Select hosting companies now employ the 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.

Then the failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text in the results. When the system detects that one of your IP addresses is returning an error, and the others aren't, it pulls that IP address out of the list. The DNS then points your domain name to the working IP address/s

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

Greylisting - Yet Another Reason Why Emails To Your Customers Are Not Getting Through
What about retention-based emails such as newsletters to your customers or customer service emails?If you're sending any mass emails to your customers/leads, then you should know about Greylisting.Greylisting (sometimes spelled graylisting) is a relatively new yet widely used anti-spam method, implemented by your customers, that automatically "drops" all incoming messages coming from your email-address.It’s based on the principle that mass email engines don't behave like a normal mail server. Normal mail servers will, if a temporary error occurs at r 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.

Then the failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text in the results. When the system detects that one of your IP addresses is returning an error, and the others aren't, it pulls that IP address out of the list. The DNS then points your domain name to the working IP address/s

If any of your IP's come back online they are restored to the 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 on the speed of your site and the nature of the 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 in the failover monitor by lowering the "time to live" (TTL) cache settings. These are the settings that other ISP's will use to determine how long to cache your DNS information.

Of course you must bear in mind the matter of how frequently data is synchronized between your website's servers. This will be the 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 behind the scenes juggling a number of unique IP addresses on different servers, is of course the most 'elegant' solution to multi server hosting.

That way, the 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, the technology is readily available and certain proprietory failure monitoring systems are now relatively cheap to apply.

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