A KVM switch allows one keyboard, video display and mouse to control several systems. KVM over IP extends that console access across an authorised network connection.
Practical example: managing several rack servers
Check ports, video, USB, resolution, authentication and remote-user requirements.
Scenario: A rack contains six servers that occasionally require direct console access.
Instead of installing a monitor and keyboard for every server, one rack console and a compatible KVM switch can provide local access. If administrators require out-of-band remote console access, KVM over IP or the servers' supported remote-management controllers can be evaluated.
Decision: Check server count, video interface, USB support, resolution, remote-user requirements and security before choosing the KVM system.
Common mistakes and selection checklist
Common mistakes
- Counting servers but not checking their video and USB interfaces.
- Assuming a local KVM provides the same functionality as remote KVM over IP or a server management controller.
- Ignoring resolution, authentication and concurrent remote-user requirements.
What happens if you get it wrong?
The console may not work with all servers, remote administration may be unavailable when it is most needed, or the chosen system may create unnecessary security exposure.
Selection checklist
- Count current servers and planned expansion ports.
- Check video, USB and cable compatibility for every connected system.
- Define local-only versus remote-console requirements.
- Check supported resolution and remote-user capability.
- Plan authentication, network access and physical security.
Local KVM
A local KVM is physically connected to the servers and console. It is useful when several rack servers need occasional direct console access without a separate keyboard and monitor for each system.
Rack console KVM
A rack console can combine a folding display, keyboard, pointing device and KVM switching in one rack-mounted unit.
KVM over IP
KVM over IP provides remote console control that is independent of the server operating system. It can be useful when network services or the operating system are unavailable, subject to the KVM system and security design.
Selection criteria
- Number of server ports
- Video interface and resolution
- USB or legacy keyboard and mouse support
- Local and remote user count
- Rack console requirements
- Authentication and encryption
- Compatible server interface modules and cables