The second disk was probably the voice storage disk the first the system disk. SCSI drives of the day were quite reliable. That is if they used SCSI. By yoir description it was not a mirrored system (raid 0). Wonder what crappy or under optioned VM system it was.
No it was not. I built the PC it was in. It was RAID 1, using ESDI drives in some controller. And I was part of the team that instructed the customer about looking at the status display on the controller (it wasn't integrated into the program in any way). The drives we were getting were _not_ reliable, although we started using SCSI drives shortly after that and reliability went up. The controller clearly showed that a drive was defective when we picked up the machine, so whatever fault is due a non-technical customer that doesn't understand how to keep the magic in the box, it was their fault (we won't go into what team of techno-geeks decided that a receptionist was qualified to look at a little LCD screen every day and verify that it said "DRIVE OK". Other than to say that it wasn't me -- I didn't have the seniority).
The system was primarily designed as an easily customized voice response system. I honestly can't remember if the customer was using anything more than voice mail on it, however (we often ended up selling VM systems "and you can move up to custom solutions later"). The programming "language" was bizarre, being a mutated offspring of a spreadsheet and BASIC. The chief software engineer ended up leaving the company to be a salesman at a bookstore, if that gives you any clues as to the nature of the beast.
It was my first job out of college, it was 1991 and Portland was flooded with the engineers escaping the sinking Tektronix, so I was happy to get a job that paid a living wage and occasionally allowed my to do circuit design, even if what I really did was (in descending order) build PCs, QC PCs, select PCs, and in any remaining time do the afore-mentioned circuit design and the occasional systems engineering.
I had an MSEE, I was wrenching on PC's, and I was happy to get the job. On my first day my boss pointed to my technician's desk and told me to learn everything I could from him, because that Friday I was expected to fire the guy.