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Re: drbd + ext3 + interbase + data lost



Hi,

On Fri, Mar 22, 2002 at 06:21:12PM +0800, Julian Gomez wrote:
> On Thu, 21 Mar 2002, Stephen C. Tweedie wrote:
> 
> > That could be anything --- hardware or software.  Are there any kernel
> > logs when this happens?
> 
> Unfortunately no. Log file just stopped at 14:34 and restarted back at
> 15:50 when it was hard-resetted.

You should probably set up a serial console, then.  See 

	http://people.redhat.com/johnsonm/ttywatch.html

for software to let another host act as a monitor and log collector at
the other end of the serial console line, and the Linux source code in
file linux/Documentation/serial-console.txt for instructions about
setting up the kernel to copy log messages to a serial port.  I use
this on all my test boxes and it makes tracking down problems like
this much easier.
 
> > Do you still have kernel console access?
> 
> Yes. SSH 24/7

kernel console != network access.

> > Can you trap any oops messages that might occur in this state, or can
> > you trigger altgr+sysrq+t or altgr+scrlck kernel debugging dumps?
> 
> I'll have them try it the next time. Hopefully something comes up - alas I
> can't do it (remote from one branch - 20 miles; another is about 250+
> miles).

Understood.  Next time you get to one of the boxes, I really do
recommend setting up the serial console if you can.  The ttywatch
program lets you set up a telnet port as a relay on the logging host
so that you can then telnet in to see the kernel log messages, as well
as logging to /var/log/ttywatch/*.

Cheers,
 Stephen





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