[ to enable write access on root filesystem in single user mode ]
	
>> If it's just mounted ro, then remount it rw. It will come up
>> ro if you boot single user.  mount -u -w /   should remount rw.
>
> The command I found to work was:
>        # mount -o rw /dev/rz0a /

After system gets booted in single user mode, root filesystem (still
anonymous in this moment) is mounted read-only.  Any write operation
is prohibited.  To enable write, 're-mount' operation has to be done
specifying block special file name associated with the filesystem. 

In the case of /etc/fstab is correctly prepared, it'll be just OK to
issue;

	# mount -u /
	
To do the same in more specific way (assuming booting from SCSI#0 disk);

	# mount -u -w /dev/rz0a /

mount(8) describes what -u option is for.  The problem is; first time
installers might have no idea about this (man page is not available)
unless he/she happens alreay to know it. 

Tohru Nishimura
Nara Institute of Science and Technology