MACROMEDIA COLDFUSION MX-CLUSTERCATS Manual do Utilizador descarregar pdf (Página 33)

What is website availability? 23

What is website availability?

It is critical to design, develop, test, and deploy web applications so they can scale well

under heavy and ever-increasing load. However, in spite of the best-laid plans and

preparations, servers can fail for seemingly unknown reasons, causing your site to become

unavailable. If and when a server fails or becomes overloaded, you want to ensure that the

failure won’t adversely affect your business by preventing your customers from accessing

and using your web application. If it does, you risk jeopardizing your bottom line with

lost sales and disgruntled customers who will look to your competitors for goods and

services.

This section defines and describes website availability and failover:

• “Availability and reliability” on page 23

• “Common failures” on page 24

• “Website availability scenario” on page 25

• “Failover considerations” on page 25

Availability and reliability

In simple terms, availability and reliability mean that you can access a website by entering

the site’s URL in your browser, and all of its features work as intended. Thus, availability

and reliability refer to the uptime of a website, which is often directly related to the

uptime of the web server and other dependent servers, such as a database server, an

application server, or a file server. For a site to be considered available, all of the servers

that provide its functionality must work.

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MACROMEDIA COLDFUSION MX-CLUSTERCATS Manual do Utilizador Página 33