Jason Watkins writes: > I've got a machine that's crashed now twice in a row around 3 am. I'm > assuming this is being triggered by something periodic daily is running.
>I'm only remote access to it, so right now I'm waiting for someone > to reboot it so I can get back in... what should I look through > to identify the problem? Does it happen every morning, or every Tuesday and Thursday (or Monday and Friday, or ...)? Is the machine on a good, voltage-regulating UPS? If not, can you see if you can put it on one for a while? I once worked around a machine that crashed every morning at about 06:15 . We never were sure why ... but it was an old machine with a dodgy power supply and at that hour the main elevators were turned on in the building. That entails starting a very large motor-generator set for each elevator, and the equipment was three-phase and the motors were almost certainly induction motors, which can draw enormous current when the rotor is not turning. I suspect they turned them on one right after the other without waiting for each to come up to speed (could a seismograph on the building have detected the torque effects?) and the resulting voltage drop caused the power supply to work too hard and overheat or else shut down from undervoltage. (The MG set was used to produce DC of variable voltage and polarity, which was used to operate the lifting motor of the elevator. The voltage and polarity are controlled by controlling the current in the field winding of the generator.) Mark Terribile __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"