Virtual Machine and Cloud Server: why they are so similar and how to distinguish between them
VPS and Cloud Servers are two very similar services which are often confused. To the uninitiated, their functionalities may seem the same, but the differences are in fact considerable. Their security and hardware are where the main differences regarding cost and performance standards lie.
The main differences between VPS and Cloud Server
At a conceptual level, VPS (Virtual Private Server) and Cloud Servers are almost identical: they are in fact both Virtual Machines which run on a Hypervisor containing the hardware.
On closer inspection however, it becomes apparent that (on a physical level), only the VPS runs on a dedicated Hyperisor, exploiting its hardware (CPU, RAM and Network) and storage capacity (physical disks) where data is stored.
Cloud servers, in contrast, are located on a group of Hypervisors (Known as Clusters) which feature separate internal hardware (CPU, RAM and Network) and shared storage. To the casual observer this difference may seem minimal, but in reality it determines the quality of service provided.
In terms of security and software longevity, VPS and Cloud Server are profoundly different. If we consider a breakdown in a VPS for example, the Virtual Machine remains inaccessible until the problem is resolved, with a significant risk of data being compromised.
On the other hand, if the problem involves one of the hardware components or the software of a Cloud Server hypervisor, the virtual machine can easily be transferred onto one of the other hypervisors in the cluster, thereby remaining operative.
Cloud Server’s one major vulnerability could be the shared storage, but most professional providers equip their infrastructures with efficient back-up systems and ensure data is written in RAID.
Which is better, VPS or Cloud Server?
The choice between VPS and Cloud Server is closely related to the user’s needs. If, for example, the user needs access to a virtual machine to carry out tests on specific applications or configurations, it is a good idea to use a VPS.
The minimal cost and dedicated software are two excellent incentives for those who require a virtual machine for short periods only. In such cases performance and security are not crucial factors, but a provider who offers data back-up on request should definitely be considered.
If, however, the priority is to have reliable machines (perhaps for development or post production) to ensure that data will not be lost, then Cloud Servers are by far the best investment. The excellent infrastructures provided by clusters are in fact an almost total guarantee of security. They are ideal for mid- to long-term projects.
How to distinguish between VPS and Cloud Servers
Many virtual machine providers ‘forget’ to specify the parameters in their offers and the average user’s limited knowledge of this area may cause him to mistake a Cloud Server for a VPS.
Generally speaking, if the parameters of the infrastructures offered are not clearly indicated, it is advisable to contact the service supplier directly. Unusually low prices should also be cause for concern, (especially in the case of Cloud Servers), as well as any shortcomings in the provision of back-up or security services.
By being aware of these warning signs and keeping the above tips in minds, the choice between VPS and Cloud Server should no longer pose a problem.
Translated by Joanne Beckwith
