Can't mount a Firewire RAID 0 volume at Startup

I have two Firewire 400 external drives connected to a Mac mini. I created a RAID0 volume with the two drives. I find that the RAID volume is not automatically mounted when the system starts up or restarts. When I login to the machine via ssh and do a 'ls /Volumes', the RAID volume doens't show up.
I then login 'normally' on the Mac mini and notice that right after the Mac OS X desktop appears, the volume icon of the RAID volume shows up about one second after the boot volume's icon shows up --- I'm assuming the delay is caused by the RAID volume mounting after I login.
My question is: how can I make the RAID volume mount automatically when the system starts up unattended?
(Note: this problem might have just happened after a Mac OS Update to 10.4.6 -- or it might have behaved like this all the time but I never noticed. I've read the threads about the hazards of updating Mac OS with Firewire drives connected . Unfortunately, I have done Mac OS Updates with the Firewire drives connected but Disk First Aid says there's no corruption.)
Mac mini G4 Mac OS X (10.4.6) PPC G4/1.42GHz/512K L2/1GB/167MHz bus/80GB
MacBook Pro Mac OS X (10.4.7) 2.16GHz 2GB RAM 256VRAM

I just wanted to follow-up with a correction and a workaround.
Correction: it's a RAID1 mirrored volume that I'm trying to mount at start-up.
Workaround: I went to my Account Preferences to automatically login as me when system starts up, and then set the idle logout time to 5 minutes (the minimum) in Security Preferences.
It's not perfect but the machine runs unattended anyway so it should be alright. I'm now very hesitant to update to 10.4.7.
In the mean time, please respond if you have any ideas.
Thanks very much!

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