Today we had interesting issue.
One server completely stalled, due to file system crash. I mean – reboot, shutdown -r now, init 6 not working.
In this case your can use magic keys (SysRq) remotely via /proc/sys/trigger
echo b > /proc/sysrq-trigger - send Alt + SysRq + B to kernel
Alt + SysRq + B – Makes Immediate reboot without sync of file systems, action is the same as RESET pressed.
Additional information:
http://en.wikipedia.org/wiki/Magic_SysRq_key
Thanks to out colleague Yuriy for this information. Useful.
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