Redundancy concepts from G&D: An overview

Redundancy concepts from G&D: An overview

KVM systems are often the backbone of the control room infrastructures. They are indispensable helpers for flexible access to and operation of computer systems. On top of that, they also optimize processes and working conditions. Beyond this, system security is also an essential aspect – especially when it comes to critical control tasks. A lack of security can affect both the KVM system itself and the computer systems. To protect such critical systems, G&D offers various redundancy concepts.

From simple setups with extender lines to complex concepts for fully redundant infrastructures with automatic switching to back-up systems or redundant control rooms: The possibilities for designing redundant structures using KVM systems and thus increasing application security are endless.

Depending on the complexity and requirements of individual applications, you can use both simple and extremely comprehensive redundancies to back up either only the KVM system, the computer side, the console side or the entire application.

Redundancy concepts for KVM systems and matrix installations

Redundant computer combined with a KVM switch

Redundancy concept 1: A KVM switch connected to two computersThis redundancy concept allows you to switch to a backup system in the event of a system failure. The two computers do not even have to be connected via network. With the help of a KVM switch, you just switch to the redundant line if the primary system fails.

Redundant computers with remote access

Redundancy concept 2: Redundant computers that are remotely operatedIn this variant, the primary and redundant computers are placed in a separate technical room. An extender line extends the computer signals that are made available again at the remote console using a KVM switch and CON modules.

Redundancy concepts for matrix installations

From simple to extremely complex – you can choose between numerous redundancy concepts for your matrix installation. In the following, we will show you the most important ones:

Line redundancy

Redundancy concept 3: Line RedundancyWith line redundancy, the workstation is designed redundantly. Two console modules (CONs) connect the workstation to the computer both via a KVM matrix and a direct line. Thanks to the CPU-UC computer module, you can operate your computer via the matrix system and, in the event of a failure, also via the direct connection. To access your computer as usual, you just have to change your workplace. When applying this concept, you can store the computer technology in a central server room.

Switched line redundancy

Redundancy concept 4: Switched line redundancyUsing a KVM switch and two connected CON modules, you can connect a remote workstation to a remote computer both via a matrix cluster and a redundant line connection. If the primary line fails, you can access the remote computer via KVM switch. A CPU-UC module lets you access the computer over both lines.

Automatic line redundancy

Redundancy concept 5: Automatic line redundancyFor automatic line redundancy, simply equip your workstation with a CON-2 module. This module picks up the keyboard, video and mouse signals at the corresponding interfaces of the workstation and forwards them to the remote computer either via matrix or direct extender line. If the primary line via matrix cluster fails, the system automatically switches to the redundant connection. This way, you will still be able to operate your computer remotely

Matrix redundancy

Redundancy concept 6: Matrix redundancyWith matrix redundancy, you can design both your workstation and your matrix system redundantly. You can access the remote computer via both matrix clusters using a CPU-UC module. If a matrix or a console fails, you can continue to access the remote computer as usual via both the redundant workstation and the redundant matrix.

Automatic matrix redundancy

Redundancy concept 7: Automatic matrix redundancyWith automatic matrix redundancy, you can use a CON-2 module to connect a workstation to both matrix clusters. In this way, the remote computer is also connected to the two matrices. In the event of a failure, you can access your computer via the first or the second matrix. If the primary matrix system fails, an automatic switchover including switchover synchronization ensures that you can continue your work seamlessly on the redundant system.

One-sided application redundancy

Redundancy< concept 8: One-sided application redundancyThe redundancy concepts we’ve shown so far are based on the assumption that a KVM device, for example a matrix, will fail. But what happens if a computer fails due to a software error? In this case, a computer-sided application redundancy offers a fitting solution, because it does not only include G&D matrix systems, but also the computer equipment. Each computer is connected via both matrix clusters and therefore remains easily accessible. Even if the primary matrix or the primary computer should fail, you can still access the redundant computer via the redundant matrix line and continue your work immediately.

Two-sided application redundancy

Redundancy concept 9: Two-sided application redundancyDepending on the security level, some applications do not only require redundant computer equipment, but also a redundant operator console or even a completely redundant KVM system. With two-sided application redundancy, you therefore install the entire KVM infrastructure redundantly. Computers, matrices and operator stations access the respective backup system in case of failure. Through CPU-UC and CON-2 modules, every workstation has access to every computer. If a line or module fails, you are automatically switched to the back-up system.

Full application redundancy

But we can still top the last, already very complex redundancy concept. Highly sensitive, security-critical areas and control rooms go even one step further and require a completely redundant technical area and a redundant control room.

Full application redundancy

But what if, in the application shown above, technical room B fails completely due to a fire or another emergency? In addition, a KVM matrix and another server fail in server room A, e. g. due to a software bug or a cyber attack. In the worst case, one of the two control rooms (in this case control room B) fails completely. And to make matters worse, one of the two console modules in control room A is on strike.

Fully redundant KVM components, systems and premises allow you to finish your work even under such extreme circumstances. Although this scenario is quite unlikely, we have already installed it just like that.

Redundancy concepts for your individual KVM installation

Is your IT installation designed in a similar way as one of our examples? Or do you have a completely different variant? Regardless for which application you need a redundancy concept – our KVM experts will be happy to support you. Together with you they will create a concept fitting your installation. We look forward to your requests.

Guntermann & Drunck

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