On Wed, 2 Jun 2010, Bryce Nesbitt wrote: > These servers run Debian Linux, and we periodically have problems with out > of control memory situations. We could save servers from a hard reboot by > sending Magic SysReq commands such as "m" and "f" (to dump Linux Kernel > memory stats and invoke the Out of Memory Killer (oom-killer). Or make a > reboot nicer by syncing disks first. These commands work fine directly from > an attached keyboard (e.g. Alt-SysRq-m). Can we get Magic SysRq over DRAC5?
Hi Bryce. Do you mean in a situation in which a shell cannot be opened on the system? /proc/sysrq-trigger can be used if you can open a shell as root (say over DRAC). The WP article shows how to use sysrq-trigger. There are plenty of situations in which a shell can be opened but a normal reboot has become impossible - I often use sysrq-trigger in these situations. The page below talks about how to use Magic Sysrq over a serial console. http://tldp.org/HOWTO/Remote-Serial-Console-HOWTO/security-sysrq.html Cheers, Rob -- Email: [email protected] Linux counter ID #16440 IRC: Solver (OFTC & Freenode) Web: http://www.practicalsysadmin.com Open Source: The revolution that silently changed the world _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
