Joe Conway wrote: > On 06/16/2010 05:39 PM, Sam Varshavchik wrote: >> Based on the assumption that you are experiencing a kernel crash, there >> are two ways of obtaining diagnostics: >> >> 1) A serial console. Going retro, getting a null-modem adapter, and >> connecting the serial port of the ailing machine with the serial port on >> another machine, adding the "console" parameter to the kernel boot >> prompt, and redirecting console messages through the serial port to >> another machine where you'll run minicom to capture the incoming serial >> port data. Hopefully, if your kernel is oopsing or crashing, you will be >> able to obtain a log a useful dump. > > I actually tried this a while back, but this machine has no serial port, > and USB-to-rs232 did not seem to work. > >> 2) Using kexec-tools to set up a recovery kernel. Adding the crashkernel >> parameter to your kernel boot prompt, reserving 128MB of your RAM for a >> recovery kernel and a small boot image. When your running kernel >> crashes, the recovery kernel, installed by kexec-tools, is going to >> generate a kernel dump, which can then be grokked by crash to generate a >> dump. >> >> In either case, you have a fair bit of RTFMing to do. >> >> And then after wasting all the time, you'll discover that you're not >> getting a useful crash in the first place. > > Hmmm, you paint a rosy picture ;-) > > But if I do nothing, my choices are: > 1) hope to get lucky on some future kernel update > 2) buy new hardware > 3) live with not using scp or rsync over ssh > > Maybe it's time for a hardware upgrade.... > I do just such a backup nightly between machines, and no lockups on machines from fc9 to fc13. Something in you hardware is possibly tickling the problem. Possible solution, add a remote syslog line to syslog.conf and keep a copy of your logs elsewhere. If the hang is in network won't work, clearly. Serial console and such might help, watching from a text console might help. All low effort and cost. Of course, any excuse to go upgrade... -- Bill Davidsen <davidsen@xxxxxxx> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
