|Linux FailSafe™ Administrator's Guide|
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You can use one of the following methods for reset:
EMP, which requires the following:
Verify that the getty processes for serial ports /dev/ttyS0 and /dev/ttyS1 are turned off (this is normally the default)
Configure the BIOS
A serial port PCI board to supply additional serial ports
A USB serial port adapter to supply additional serial ports
STONITH network-attached power switch,which requires that you enable a getty on /dev/ttyS0.
The getty process for serial ports /dev/ttyS0 and /dev/ttyS1 should be off if you are using the EMP port for reset. The getty process for serial port /dev/ttyS0 should be on if you are using STONITH.
To change the setting, perform these steps on each node:
Open the file /etc/inittab for editing.
Find the line for the port by looking at the comments on the right for the port number.
Change the third field of this line to off or on, as required. For example:
t2:23:off:/sbin/getty -N ttyd2 co_9600 # port 2
Save the file.
Enter these commands to make the change take effect:
# killall getty # init q
To use the EMP for reset, you must enable the EMP port in the BIOS (server systems shipped by SGI have it enabled by default). If you are comfortable not having a serial console available, then the remaining serial port can be used for reset purposes. This involves going into the BIOS and disabling the console redirection option.