What is a KVM switch?
What is a KVM switch (KVM switch)? Is it a suitable tool for IT infrastructure management work?
A KVM switch (KVM - keyboard/video/mouse) is used for remote access to IT devices. These devices are often equated with serial consoles, as both are used for out-of-band (Out-Of-Band) management of IT networks. The difference lies in what specifically each device allows access to and how it allows communication with connected equipment.
Access to the server
A KVM switch is a tool that is essential for accessing multiple computers or servers stored in a rack. Various types of KVM switches are available that provide local, remote and company-wide access to individual servers, and allow you to specify and control who has access to them. KVM switches are typically used by administrators who may or may not be located in the data center or branch office where the servers are located. A single "keyboard switch" is all that is needed to support multiple devices in different locations, saving space, time and effort.
Network access
Serial consoles also provide remote access and allow you to decide and manage who in your organization has that insight. KVM switches, however, are designed to work with the network infrastructure behind servers, such as firewalls, routers and switches. They are typically used by administrators. Serial consoles are particularly useful when something on the network is not working and access is needed to troubleshoot or resolve problems.
KVM switch in daily operation and serial console as a lifeline
In most KVM switch applications, they are constantly used to access information on servers. They provide a user's daily interface with the information on those machines. Serial consoles, on the other hand, are only available when the user (or his remote IT provider) needs them. They are like a back door that provides access to the inside of the network when it can't be accessed any other way, such as due to a failure. Therefore, it is understandable that the two tools differ in the type of connection.
A serial console allows you to remotely access and control network devices using a command-line interface (CLI) that allows you to use the devices' native language, essentially writing code. In other words, the user interface won't be as graphical or as attractive as a KVM switch or "keyboard switch," because it's not needed.
You need simple, secure and reliable out-of-band access and a point-to-point connection that allows you to issue serial commands or text interaction with network devices. Yes, it's old school. But the CLI interface offers the most efficient way to script and automate any changes that need to be made, so you (or your remote IT provider) can respond quickly to failures without worrying about connectivity issues or other factors slowing things down.
Nowadays, some serial consoles are equipped with cellular features to further extend coverage and provide true out-of-band access in case wired networks fail. It's like an insurance policy that ensures you'll always have the ability to get into your network when you need it most.
The KVM part of the switch has a dual function
If you're wondering whether you need both a KVM switch and a serial console (or several such devices), the answer is probably yes. However, in some smaller applications, a KVM switch with a serial console and serial ports can meet the needs of both server administrators and network administrators - in smaller organizations, these may be the same people. However, this is usually only possible in small locations where only one or two serial connections need to be made. A trusted service provider or vendor can help you decide if this solution is right for your needs.
Serial console for visibility and control over other IT equipment in the rack
By adding a serial console to provide access to network equipment, other IT infrastructure components in the rack, such as UPS and power distribution units (PDUs), can also be connected. This means that network administrators can observe and remotely control these devices, which can go a long way toward preventing circuit overloads or other power quality and distribution problems. Such situations can threaten the trouble-free operation of IT systems.
In addition, when connected to a serial console, all these devices can be managed via a single IP address. This is more than just a matter of convenience and efficiency. Consolidating multiple devices under a single IP address also means significant direct cost savings for the company.
Software to provide a single point view of all KVM switches and serial consoles
For network administrators who oversee many geographically dispersed sites, a remote, consolidated view of all devices in one location is useful. Even better is a single view that allows you to check everything, everywhere.
The key to comprehensive and secure data center infrastructure management (DCIM) across the enterprise is to add software that connects to all serial and KVM switch consoles. The right software can enable unified and secure monitoring and control from a single screen at a remote location. For larger organizations, this is the most important part of a technology stack or toolkit that simplifies and streamlines remote DCIM management.
IT management solutions available from Vertiv
Vertiv offers the hardware you need to set up a remote access and IT management solution. Our offerings allow you to perfectly match the needs of server and network administrators, no matter how large, small or geographically dispersed your IT ecosystem is. Products include:
- Vertiv™ Avocent MergePoint Unity™ digital KVM switch with KVM-over-IP technology and serial console management.