What's cloud and what is just a VPS?
While there's no formal definition of what the cloud is at this time, we tend to consider there being a requirement of a few basic aspects in order for a service to totally qualify as cloud hosting.
Before we go into the differences, lets explain how they're the same.
Both VPS & Cloud Servers use virtualized environments.
Both VPS & Cloud Servers use resources from a single hypervisor.
As you can see, both a VPS and cloud servers use the same basic virtualized environment to get started.
The benefits of a Cloud Server over a traditional VPS?
Despite the similarities to a traditional VPS, a cloud server has several significant advantages that can be beneficial to a website owner.
Cloud Servers have three primary advantages over a traditional VPS.
Near limitless flexibility with resource sizes.
On the fly resource upgrades, sometimes without even requiring a reboot.
Significantly better redundancy
Centralized redundant storage
The first two advantages go together; with a cloud server, you're able to upgrade to significantly higher server specifications, and you're able to do it on the fly.
This means that if your site starts to receive an enormous amount of traffic, it's not necessary to migrate your site to a new server. You can simply add more resources, and the changes will take effect immediately, on the existing server.
The second two also go together quite well. In the traditional VPS environment, your server is hosted on a single hypervisor, with typically the hard drives running in a RAID 10 array.
With a cloud server, your server can be hosted on any of the hypervisors on the cloud, because your data is hosted on a centralized storage system called a SAN.
With this arrangement,
if a hypervisor fails in the cloud, another one can simply take over the work of hosting your cloud server.
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