Modify BIOS Parameters

How to use the xtbiosconf command to change BIOS settings on XC systems.

There are a few, rare circumstances where it may be necessary to modify BIOS parameters, for example, in order to troubleshoot a problem, or if there is a need to test a new BIOS version on a small set of nodes before implementing the change across an entire system.

The xtbiosconf command allows administrators to specify BIOS parameters at the node, blade, chassis, or cabinet level. BIOS parameters can be associated with a BIOS revision, numeric parameter offset or parameter name, and target nodes. BIOS revision wildcards are supported. The BIOS parameter data is saved in a database on the SMW, and made available automatically to blade controllers via the ERFS file system. In most cases a cold reboot of the affected nodes is needed to apply the new settings.

CAUTION: Do not attempt to use this command except under guidance by Cray support personnel, who will provide all the steps for shutting down the nodes, changing the settings, and bringing the nodes back up. Improper use of this command can damage a system.

The following command displays the current BIOS Parameter settings for the entire system:

smw~> xtbiosconf --show s0
==============|======|===================================
              | BIOS | BIOS
Node          | REV  | Parameter
==============|======|===================================
c0-1c0s0n1    | 4030 | numlock=1
c0-1c0s0n1    | 4030 | acpiauto=0
==============|======|===================================
c0-1c0s0n2    | 4030 | numlock=1
c0-1c0s0n2    | 4030 | acpiauto=0
==============|======|===================================

For more information see the xtbiosconf man page.