On Fri, May 27, 2011 at 11:20:36AM +1000, Alfredo De Luca wrote: > Hi all. > > We have Red Hat Enterprise Linux Server release 5.5 running on Sun Blade > x6270 and occasionally the server hang with just error message in the logs: > > May 23 14:37:41 xxxxxxxxxxxx kernel: SysRq : Resetting
Looks like someone hit the Magic Sysrq key for doing a reset: http://en.wikipedia.org/wiki/Magic_SysRq_key#Magic_commands (look at 'b' in the qwerty column) This is something done either from a keyboard, from a serial console (if that's set up) or someone running 'echo b > /proc/sysrq-trigger'. I think some load-balancing software uses the /proc/sysrq-trigger method to kill wedged server, so it might be an indicator something else is resetting the system. -- Jonathan Billings <[email protected]> College of Engineering - CAEN - Unix and Linux Support -- redhat-sysadmin-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list
