Xserve Processor One maxed out

I have an Xserve running 10.4.10, 2GB ram, three 500GB drives, two mirrored, 600 users, attached to Open Directory Master. It is a near clone of a 3 other Xserves based on grade level.
Every single morning we have to hard restart. The upper lights for processor one are pegged to the max, no logins, mouse moves but no action. This will sometimes happen after a few users log on, say an hour or two after school starts. There is no info at all in Console.
Seems unrelated to a CCC job which I turned off. I am also running Retrospect 6.1, but not until the weekend. I SUSPECT it's the processor itself, but I was wondering what other steps I might try beforehand. I have two mirrored drive and the third drive as a backup. I was going to first remove processor one and put proc. two in it's place... then I was going to clone to the third single drive if that didn't work.
I guess my question is.... is there anything I might be missing before I take the above actions?
Thanks,
LK

Retrospect gets my vote. It really is an unstable piece of software for a server environment. You'll find numerous people have had issue with it.
The fact that it's not actually performing a backup at the time doesn't seem relevant.
I'd also err away from thinking it's a physical processor problem. When a single processor gets overloaded, it's usually a software problem (multiple CPUs only come into play when using multiple applications and/or applications that are multi-threaded to take advantage of multiple processors). If a single processor gets pegged it's often because a software program is spinning its wheels.
It should be relatively easy to tell if that's the case. Activity Monitor (or, preferably, top run at the time the CPU is maxed will give you a pointer as to what process is consuming the CPU cycles.
Server Monitor will give you a better picture of the hardware, including error states on any components, including the CPU.
My bet is on the software, though.

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My old powerbook came with 128, I added 512 to start then exchanged that with a 1gig so it was running on 1.128. No problem at all. Spec said max was 640.
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