Thanks very much for the answer. For the use of dd, I found this thread:
It offers advice for "Cloning an entire hard disk:"
dd if=/dev/sda of=/dev/sdb conv=notrunc,noerror
That should include the MBR.
I'm unsure on your answer about formatting the swap partition. I can imagine that if it is unformatted that it could cause system errors when booted, but would the above described method of copying the whole disk not effectively format the swap partition?
Is there a sure way to evaluate for sure which device is the original? Should fdisk -l be sufficient? If so, that covers questions 2 and 3. Question 5 appears not to exist, and I hope for but don't expect an answer to question 4. (Nevertheless, not screwing up the system is my number-one priority, so avoiding pitfalls is important.) That leaves questions 1 and 6. Anybody care to have a go at them?
As to question 1, opening the case and looking at the number of hard-disks seems the best solution, but shouldn't a Linux Live CD enable me to find all of the system disks before opening the case? How can I know which disks are being used where, especially considering the system uses a RAID array?
As to question 6, I really need an answer here. If making sure I don't screw up the system during the cloning process is my number one concern, then creating a system that is an effective instead of a broken clone is my number two concern. How best to test it?