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Yes, you can specifically boot from the alternate disk.
I have an x4270m2 so I'm not sure what kind of disks you have.
You'll have to consider the device differences.
Here's my mirrored root pool:
# zpool status
scan: resilvered 71.8G in 0h8m with 0 errors on Wed Dec 5 08:00:51 2012
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c0t5000CCA012C8323Cd0 ONLINE 0 0 0
c0t5000C500438124F3d0 ONLINE 0 0 0
errors: No known data errors
I would need to boot this system specifically from the second disk,
c0t5000C500438124F3d0, from the system's BIOS.
Then, you can identify from which disk the system is currently booted,
# prtconf -v|sed -n '/bootpath/,/value/p'
you should see the primary disk set in the output.
set the parameter for the secondary/mirror disk, give it a name.
boot the system to ok> prom.
from ok> boot <your secondary/mirror disk name>