Types of VPS and their architectures

 Types of VPS and their architectures

Let's now talk about the types of VPS and their architectures. When we talk about architecture we will be referring to the way in which these solutions are implemented and mainly VPS servers can be configured in 4 different ways

We will now explain each of these types of VPS

OPTION 1 – VPS WITHOUT CLUSTER HA – Spof (Single Point of Failure)

Single Point of Failure VPS. It is an economic modality of VPS where everything runs on a single server. By design, its level of availability is low because it depends on a single physical element, however with some luck if the hardware is not damaged it gives the feeling of stability.

OPTION 2 – VPS ON HA CLUSTERS

It is a more advanced modality than the previous one because the service runs on multiple servers (Cluster). It is ideal for companies because the service self-recovers and restores itself in the event of physical damage by restarting the Client's server in another node of the Cluster without human intervention and with the same information it had before the crash, thus recovering from physical damage it takes a few minutes. Here the availability rests on the design and not on luck.

OPTION 3 – VPS OVER HA CLUSTERS and DRS CLUSTER

It maintains all the functionalities of the HA Cluster, but also adds a workload balancing service. In the event that there is a congestion of the service, either at the CPU level or at the memory level. The DRS Cluster will automatically make the adjustments and will move the VPS to a node with better performance or one that is less congested, in said adjustments it will evaluate the memory processes that require special treatment and through ballooning techniques it will take actions to maintain stable service.

OPTION 4 – FAULT TOLERANCE VPS

It is an ideal option for very critical systems and works as follows. A Fault Tolerant system creates a server identical to the production one and keeps it running with the same data. When a data is written, the writing is done in the 2 servers simultaneously and both servers keep the same information. In the event that the infrastructure suffers critical damage and a server in its entirety goes out of service, the first thing is that the Fault Tolerance system maintains operation without experiencing any downtime since now the second server (which is located in another physical infrastructure ) continues with the operation because it has the same information from the server that went out of service with the same IP. Second. In addition, when said failure occurs, the system automatically generates another copy to replace the affected server and generates another new and consistent Fault Tolerance system.

What is a Cluster and what is it for?

 

As can be seen in the illustration. A Cluster consists of joining multiple servers to improve: The availability of services, eliminate single points of failure, favor the performance of applications, to balance loads and to be able to scale solutions and is the recommended option for use in Companies who handle critical roles.

ON THE BAD DAY, HOW DO THESE VPS WORK?

VPS without Cluster

Being on a single server (Single Point of Failure) it inevitably goes down when facing physical damage until the machine is repaired and the VPS is relocated again. In this case, because it is a configuration without a Cluster, you can face a few hours, while the provider reconfigures the entire service again.

VPS with HA Cluster

Being in a Cluster, without Human intervention and transparently, the service is restored in a few minutes. By design, all elements are duplicated and availability is increased because single points of failure have been eliminated.

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VPS with HA Cluster and DRS Cluster?

It maintains the above features, but also adds load balancing by moving the Client's server to a node with better resources. Note: vSphere Enterprise with vCenter is required

VPS with Fault Tolerance

It maintains the previous characteristics, but adds, in addition to balancing, the guarantee of 100% availability in the design. Note: vSphere Enterprise with vCenter is required  best hosting services 

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