topic Re: iLO and SysRq ? in Operating System - Linux

iLO and SysRq ?

Morten Lange — Mon, 01 Sep 2003 10:37:48 GMT

Hello

I am sorry for "crossposting", (see the ProLiant server forum ) but I think this is important:
Has anyone managed to issue a SysRq sequence to a Linux console through iLO (or otherwise) to a blade server such as BL20p ?

Best Regards,
Morten Lange

Re: iLO and SysRq ?

Thilo Knoch — Mon, 06 Oct 2003 10:56:29 GMT

I have never worked with a blade server, but at least the old RILOE card does not transmit the Print or Alt-Print(=SysRq) Key, too.
And you can not even define SysRq via "Remote Console Hot Keys" with this board.
If it is no problem to build a customized kernel, there could be a workaround/check described in the kernel documentation:
(/usr/src/linux/)Documentation/sysrq.txt
...
* I hit SysRQ, but nothing seems to happen, what's wrong?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
There are some keyboards which do not support 'SysRQ', you can try running
'showkey -s' and pressing SysRQ or alt-SysRQ to see if it generates any
0x54 codes. If it doesn't, you may define the magic sysrq sequence to a
different key. Find the keycode with showkey, and change the define of
'#define SYSRQ_KEY 0x54' in [/usr/src/linux/]include/asm/keyboard.h to
the keycode of the key you wish to use, then recompile. Oh, and by the way,
you exit 'showkey' by not typing anything for ten seconds.
...

Re: iLO and SysRq ?

Louis Bouchard — Tue, 07 Oct 2003 11:06:09 GMT

Hello,

I'll take care of crossposting the answer. Here is some trick that worked for me.

I used /proc/sys/kernel/sysrq-key which is usually mapped to 84 (PrintScreen) and remapped it to 109 (PgDown). Here hare the steps :

1) Add "kernel.sysrq-key = 109 into /etc/sysctl.conf

2) Modify the kernel value with
# echo 109 > /proc/sys/kernel/sysrq-key

3) Map PgDown+p to a hot key in the Virtual Console for ILO (to test that SysRq is working)

You should see the content of the registers.

Hope It helps,

...Louis