So I've finally yanked the original The Eleven hard drive from the third revision server. It's a 4GB Quantum IDE drive that had been shuffled to secondary duty, after the installation of a new 40GB Western Digital IDE drive.

To replace the 4GB Quantum IDE, I've thrown in a SCSI controller I've had laying around and a 18GB Seagate SCSI-3 drive. Unfortunately for me the driver for the SCSI controller is the sym driver. After hooking up the drive and rebooting, kernel panics occurred in under 4 minutes.

So googling around for "VTOBUS FAILED", I discovered ...