Open Boot Firmware - nvalias backup_root - Command Behavior

My configuration is, a Sun Fire 280R running Solaris 9
with two duplicate hard drives, setup as a software RAID1
mirror.
I have also done the open boot command:
OK
nvalias backup_root /sbus@1,f8000000/esp@1,200000/sd@3,0:a
(telling open boot that the backup root device is the second phyical hard drive in the mirror)
And then:
OK printenv boot-device
boot-device = disk net
OK setenv boot-device disk backup-root net
boot-device = disk backup-root net
OK nvstore
I know the above commands sets the open boot firmware
to boot from the second drive in the mirror rather then the mirror drive itself if the mirror should fail.
Yet, I am unsure if this will just boot into open boot firmware's single user mode, or if it will edit the vfstab and boot multi user using the second physical drive for all references of slices in the vfstab.
When I first setup the drive mirror (RAID 1) I used the command: metaroot to edit vfstab, to reference the mirror device rather then physical drive and slices.
For example: metaroot d54
This changed the vfstab to point to the d54 mirrored
device rather then either of two physical drives.
So, my question is:
Does setting the open boot nvalias command change the vfstab in the multi user boot environment as the metaroot command did , or does it just let open firmware boot to a single user mode, then letting you use open boot firmware to manually change the vfstab to reflect the the
surviving drive of the mirror.
Thanks in advance for any help.

I power on and am immediately in Open Firmware (it says Welcome to Open Firmware) black text on white with > prompt. It suggests "mac-boot" or "shut-down." the latters shuts it down; choosing boot changes the screen to grey with the alternating Question ?/Finder Man folders. Then, at least for the next 10 minutes, nothing happens (haven't waited longer than that). Doesn't boot into Target Disk Mode. When you try to boot from disk, it goes to Open Firmware; if you choose mac-boot again holding C, it foes to a Folder Finder Man on it and doesn't blink--which means it found a system and is booting--except nothing else happens (at least for the few minutes I have waited in the past. Am I just impatient?). I removed the hard drive and tested it in an enclosure--it's fine with an intact installation of OS X and replaced the case screws and it immediately booted into OS X. I updated the system , but upon restart it went straight back to Open Firmware. I think I need to designate a Start up disk. How do you do that from Open Firmware. Or in UNIX for that matter? Can I get to Unix from Open Firmware (I have X11 installed on all my machines)? As I am typing this, the PowerBook spontaneously began to boot into OS X but when it got to the point where the boot screen changes to the blue system, it restarted and went to Open Firmware.

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I've been neglecting this project for some time.
I just wanted to let anyone else in my situation know that the sun OpenBoot documentation was very helpfull in my sucessfully setting a mode with the card.
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