Lately I’ve found myself in the middle of several discussions about how Rackspace Cloud Servers and other platforms like it (Amazon EC2, Linode, GoGrid, etc) differ from traditional VPS environments. While there are similarities, they are by no means the same thing. Let’s take a quick look at some of the key differentiators and advantages.
A Cloud Server is a virtual dedicated server instance based on our custom implementation the Xen Hypervisor that run on very robust hardware. These server instances offer truly dedicated and protected resources which isn’t the case with a VPS (virtual private server). While you may get a small portion of dedicated memory, there is generally no dedicated CPU allocation, disk i/o, network i/o, etc. In addition, most VPS providers only offer smaller amounts of resources, 256MB-1GB of memory and no options above this. And the largest problem by far is VPS platforms are typically oversold, so one physical host machine is running far too many customers and this turns into a resource allocation nightmare causing server crashes or poor performance (or both). There is no isolation from other customers.
With a Cloud Server you always get the full amount of allocated memory, CPU, network i/o, etc that you are paying for and there are some great perks as well, such as the ability for your CPU allocation to burst when there are free CPU cycles on the host machine or when it is heavily underutilized. So often you end up with far more CPU allocation than what you are paying for as the host servers powering Cloud Servers are never oversold.
Now, that being said, lets talk about some of the real “cloud” features…
Spin up one, ten or 100 Cloud Servers in real-time via our control panel or programmatically via our robust API.
No need to worry about finding the best fit between 2 or 3 options. The Rackspace Cloud offers a wide range of instance sizes so you can ensure you are paying only for the resources you need at that time.
Near Instant Scaling
One of the best features of the entire platform is the ability to instantly resize (in near real-time) your Cloud Server instance with a few clicks in the control panel or an API call. Once this event is triggered everything else is automated and takes only a few minutes (depends on how much data is on the instance). Your new instance either larger or smaller will be created and a snapshot of your current Cloud Server is taken and restored to the new instance moving over all your data and configurations (no data migration or reconfiguration necessary). Once you confirm that everything is working with the new Cloud Server instance you can finalize the resize which moves your IP address(es) to the new server instance.
Hourly Billing & Utility Bandwidth
Utility billing is essential for any Cloud platform and something else you will not find from a VPS provider. You pay for your server instances on a per hour basis, so if you only need an instance for a certain amount of days/weeks that is all you pay for. Or if you need to move up and down on your resources you continue to pay only for what you are using. Bundled bandwidth is also something the VAST majority of users don’t exceed. We have broken this out to save you even more money instead of bundling it into the cost which always carries a dollar amount to it.
No Bloatware Installed
No control panels or other software installed by default, Cloud Servers give you straight SSH/command line access to your Linux server environment just like you would have with your own dedicated server. If you choose to install a control panel, you certainly can, but we do not make this decision for you.
Server cloning allows you to provision a brand new Cloud Server instance on the spot from any of your current Cloud Servers which will contain all that servers data and configurations. You can also launch a new Cloud Server anytime from a backup image from any other server on your account.
This isn’t necessarily a difference between Cloud Servers and VPS platforms, but data persistence is a huge feature of the Cloud Servers platform when comparing to other Cloud infrastructure platforms such as Amazon EC2. Your data on Cloud Servers is stored on a local high-performance RAID10 array on the host server, so even in the event of a hardware failure your data is safe and will be there when the server is brought back online, unlike Amazon EC2 where all that data in memory simply disappears unless you have another storage solution implemented.
These are just a few of the big differences between a true Cloud hosting platform and a VPS environment. If you have any questions or feedback leave a comment below.