IBM BladeCenter HS20 Installation And User Manual page 27

You can also press keyboard keys in the following sequence to switch
keyboard/video/mouse control between blade servers:
NumLock NumLock blade_server_number Enter
Where blade_server_number is the two-digit number for the blade bay in which
the blade server is installed.
Although the keyboard that is attached to the BladeCenter unit might be a PS/2
style keyboard, internal communication with it is through the USB. The operating
system in the blade server must provide USB support for the blade server to
recognize and use the keyboard and mouse. When you are not running an
operating system that has USB device drivers, such as in the following situations,
the keyboard responds very slowly:
v Running the blade server integrated diagnostics
v Running a BIOS update diskette on a blade server
v Updating the diagnostics on a blade server
v Running the Broadcom firmware CD for a blade server
If there is no response when you press the keyboard/video/mouse select button,
you can use the management-module Web interface to determine whether local
control has been disabled on the blade server.
If you install Microsoft Windows on the blade server while it is not the current owner
of the keyboard, video, and mouse, a delay of up to 1 minute occurs the first time
you switch the keyboard, video, and mouse to the blade server. During this
one-time-only delay, the blade server device manager enumerates the keyboard,
video, and mouse and loads the device drivers. All subsequent switching takes
place in the normal keyboard-video-mouse switching time frame (up to 20 seconds).
Media Tray select button: Press this button to associate the shared BladeCenter
unit removable-media drives and USB ports with the blade server. The LED on the
button flashes while the request is being processed then is lit when the ownership
of the removable-media drives and USB ports has been transferred to the blade
server. It can take approximately 20 seconds for the operating system in the blade
server to recognize the removable-media drives and USB ports.
The operating system in the blade server must provide USB support for the blade
server to recognize and use the removable-media drives and USB ports. The
BladeCenter unit uses USB for internal communication with these devices. If there
is no response when you press the media tray select button, you can use the
management-module Web interface to determine whether local control has been
disabled on the blade server.
Activity LED: When this green LED is lit, it indicates that there is activity on the
hard disk drive, flash drive, or network.
Location LED: When this blue LED is lit, it has been turned on by the system
administrator to aid in visually locating the blade server. The location LED on the
BladeCenter unit will be lit also. The location LED can be turned off through the
management-module Web interface or through IBM Director Console.
Information LED: When this amber LED is lit, it indicates that information about a
system error for the blade server has been placed in the system error log. The
information LED can be turned off through the management-module Web interface
or through IBM Director Console.
Chapter 2. Power, controls, jumpers, switches, and indicators
15