Friday, January 30, 2009

KVM over IP overview

In the world of KVM switching, there is an emerging technology called KVM over IP. This allows you to have the basics of a KVM switch, whether it is a USB switch or a DVI KVM switch, and access those servers from anywhere in the world that you have internet access. KVM over IP switches can be especially useful if you are not on site with your servers, as you can connect to them and configure them all from anywhere in the world with one IP address! KVM over IP solutions can range in size from a 4 port KVM over IP switch or up to 1,000's of servers. There are also management appliances for KVM over IP that can be used to have global control over many KVM switches, KVM gateways, and any other devices on your KVM network. With KVM over IP you use a client such as VNC viewer, or a webbased Java client. These give you connection the server in the KVM over IP switch, and allow you to have communication to the USB or PS2 attached servers.
You can use DVI or VGA video with KVM over IP switches. You can also give IP access to an existing non IP KVM switch. This can be especially useful if you wanted to keep a legacy KVM switch in place and still have IP connectivity to your servers. You would need a KVM gateway to attach to the console side of your KVM switch, and that acts as a buffer between your switch and the internet. I see KVM over IP as a rising technology and I think in our fast paced world you will see more and more KVM switches migrating over to KVM over IP.

Wednesday, January 28, 2009

KVM extenders and KVM switches

If you are trying to locate your keyboard and mouse a great distance away from your PC or KVM switch, a KVM extender can help you. A PS/2 KVM extender gives you the ability to go further than the typical 20-25 ft limit for PS/2 cables. A USB kvm extender would allow you to go further than the 16 ft. USB limit. A KVM extender can run over cat5, cat5e or cat6 copper cable. They can also run over fiber optics and are called Fiber optic KVM extenders. These fiber optic KVM extenders run over singlemode or multimode fiber. You can achieve distances of up to 1000 ft typically with the copper KVM extenders and the fiber KVM extenders will take you kilometers.

Tuesday, January 27, 2009

KVM switches

A KVM switch (with KVM being an abbreviation for Keyboard, Video or Visual Display Unit, Mouse) is a hardware device that allows a user to control multiple computers from a single keyboard, video monitor and mouse. There are many different technologies involved in KVM switching, such as KVM switching over IP (ethernet), USB KVM switching, and USB and DVI KVM switching . You can have ps2 KVM switches or a USB KVM switch. KVM switches commonly come with VGA analog video outputs, but with DVI becoming more popular the industry is adapting.