I discovered a very mission-critical server (the one that handles mail for 5000 people) had only one of its two redundant power supplied plugged in. When I plugged in the second power supply, the chassis stayed up but one of the cheap-ass Escalade RAID controllers began dropping disks off line and the system crashed. When I unplugged the power supply, the disk errors stopped. Luckily, the filesystems fsck-ed clean.

That's about the weirdest hardware thing I've seen in a while.



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