So-called "hybrid private clouds" represent the best possible architecture variant for a customer with a number of advantages.
What are Hybrid Clouds?
In general, the term describes the combination of local servers at the customer site with virtual servers offered by an Infrastructure as a Service (IaaS) provider such as Deutsche Telekom with the Open Telekom Cloud.
IaaS providers operate large data centers that are often redundant and even distributed over different sites. Ultimately, the goal is that a single end customer does not have to invest time and effort for these high-performance data centers themselves, but can instead book a fixed payload or simply "on-demand" resources.
Advantages and disadvantages of local and cloud servers
Cloud servers can be of any size and performance, but the location where they are operated is not, of course, the client's place of business. The data must be transmitted over the Internet between enterprises and the cloud.
In general, the possible network speeds in local LANs are constantly increasing. It is almost always a multiple of 1 Gbit / s, which is common with the Ethernet standard in steps of 1, 10 or 40 Gbit / s today. 1 or 10 GBit / s technology is available for building a local LAN at reasonable prices.
In contrast, Internet accesses are offered as a VDSL variant with e.g. 50 or 100 MBit / s (not Gbit / s !!!) in the download and a maximum of 10 MBit / s for upload. Internet connections with 1 or 10 GBit / s are very expensive.
But even if a company orders an expensive 10 Gbit / s Internet connection, it is not guaranteed that this speed can be used to the target cloud provider, because the Internet basically includes "shared bandwidth".
In summary, this means that a company can achieve much faster speeds at lower costs in the local LAN than to a cloud provider.
The local server in the enterprise is located in the fast and cheap local LAN and can be reached easily with 1 or 10 Gbit / s. The local employees in the company have very fast access. Other branches or home workers, on the other hand, would have to access the local server through the Internet as in the described cloud variant and therefore have a speed disadvantage.
The local server must, of course, also be protected against failure and should therefore be designed at least redundantly, which in turn causes effort and costs.
With the pure cloud variant no data would be retrievable in case of an internet failure and the branches would not be able to access the local option. There are annoying down times in this case.
The best of both worlds
The best solution is therefore the design option of a hybrid cloud that combines cloud servers and local servers so that the disadvantages no longer exist but the advantages can be fully utilized.
We want to demonstrate how a hybrid cloud is used in a customer example. The company Hauswerk GmbH is very broadly positioned and active in many business fields, including communications, security, electrical, energy and environmental technology.
The requirement for a professional data storage solution is correspondingly high.
Hauswerk operates a cloudplan private cloud with a local and a virtual server in the Open Telekom Cloud. The company's data are processed at the headquarters of the company and by employees who work in field services. In addition, files are exchanged with customers and business partners.
Since the overall data volume of the company is large, the data cannot be synchronized completely to the employees' devices, in particular it is not possible to synchronize the entire data volume to the equipment of the external field service.
Many employees therefore work with remote access and access the required data in real time. If Hauswerk were to operate only one server locally, the access would be possible, but the speed would be reduced, since the data would have to be loaded by the employee from his mobile location on the Internet and then via the company's internet access.
The additional cloudserver is changing the possibilities, because the field service technicians automatically accesses the cloudserver, which is much faster for them than the local server in the company.
For the team at the company's main location, however, the local server can still be reached with "highspeed". Local server and cloud server synchronize themselves in the background. Even in the case of an Internet failure, local employees as well as the field service can continue with the work, the failure is not noticed at all. If, in addition, one of the two servers fail, the accessing devices of the employees switch to the other server - for maximum availability!
When the sales team of Hauswerk sends web links to its customers, i. a link in an email that allows access to a file or folder, this data will be loaded from the cloudserver because of the faster access, the same access way used by the external field service employees.
Only the advantages taken over
A hybrid private cloud therefore takes advantage of a local as well as a cloud server variant and eliminates the respective disadvantages.
Hybrid Clouds from cloudplan can be built as complex as required. They can span cities and countries, include redundant clusters, and even provide hierarchies of storage servers.