Today I learned... that scsi is not hot-swappable.

The drives may be but the cables for damn sure aren't. I was going to try to set up this raid array we just got at work and as soon as I plugged the cable in the server blue screened... Then I rebooted and it was showing 2 failed drives. I spent about 15 minutes in the config and the Perc tools trying to find a fix and couldn't...

sucked it up and told my co-worker who then spent less then 2 minutes fixing it.

luckily it is an old server and not mission critical.