Solaris SVM boot cdrom with metadevices

First, boot from the media:

# boot net -s

Now mount one of the subdisks read-only, so you cannot accidentally damage the subdisk:

# mount -o ro /dev/dsk/c0t0d0s0 /a

Then set up the current booted environment so it can use Solaris Volume Manager:

# cp /a/kernel/drv/md.conf /kernel/drv/md.conf
# umount /a

Now update the Solaris Volume Manager driver to load the configuration:

# update_drv -f md

Ignore any error messages from update_drv:

# metainit -r