In the world of web hosting, there's plenty of terms that get used without companies providing adequate definitions. I wanted to take some time and share a few words with you about Redundancy.
Redundancy is in layman's terms backup. There are also several different types of redundancy: Network, Hardware, Power, and Geographic. A solid web hosting company will have multiple layers of Redundancy to ensure that your data is safe and to maximize your uptime.
This backup is simply for the network a web hosting company uses to get you online. Reliable proviers have multiple internet carriers that their servers use to ensure that your website never goes down.
This backup is for the physical pieces of server hardware. For instance one layer of redundancy is for the hard drives. Here at Host Duplex, if a hard drive fails in our Dell PowerEdge servers, your site will not go offline, we have hot spares in place so our RAID arrays are immediately rebuilt. We have a similar system for our sticks of RAM.
These are the backups for the power that keeps your servers and data center running. All of our servers have redundant power supply units. Each PSU has a feed from a different utility company. Each feed is also connected to it's own UPS (uninterrupted power supply) which hold 3 hours of battery backup should the data center lose power, which is also connected to diesel generators should a power outage last longer than 3 hours. So if an entire feed fails, including the feed's UPS and generator, there is still a second feed from a separate electric provider with its own UPS and generator to keep your site online.
Finally there is geographic redundancy. Host Duplex provides geographic redundancy services so that in the case of a complete datacenter failure, your site can be rerouted to a different datacenter. I'm proud to say our data center is protected like Fort Knox and has enough redundancy to remain operational through natural disasters. However, should the apocalypse take down our data center, Host Duplex offers services to have your site working non-stop in our Denver datacenter.
Hopefully this clears up any confusion or questions regarding Redundancy. If you have further questions, feel free to comment, or shoot us an email directly.