#This doc will assume the failed drive is wd1
#if the failed drive is wd0, boot off of the floppyR media and follow
#the following procedure, making care to swap wd0 and wd1 in the procedure.
#shutdown the machine
#replace the failed drive with a new drive. if the drive was previously
#in use as a softraid component, you need to wipe the drive. this can be
#done by formatting the drive.

#startup the machine.
#at the boot> prompt, enter "boot bsd.inst" this will start a kernel
#which supports raid, but will not autoconfigure your raid partitions.

#we need to initialize the MBR on the replacement drive.
fdisk -i wd1

cd /root
#pull the current disklabel off the working drive.
disklabel wd0 > mylabel

#edit the disklabel to change the RAID slices to FFS slices.
sed 's/RAID/4.2BSD 2048 16384 16/' < mylabel > ffslabel
disklabel -R wd1 ffslabel

#format the new slices to make sure the drive is wiped clean to prep.
newfs wd1a
newfs wd1d
newfs wd1e

#now load the RAID label onto the drive.
disklabel -R wd1 mylabel

#reconstruct raid0
raidctl -c raid0.conf raid0     #configures the raid device
raidctl -A no raid0             #disables the autoconfigureing of the device
raidctl -v -R /dev/wd1d raid0   #reconstructs the failed component
raidctl -A root raid0           #enables the autoconfigureing of the device.

#reconstruct raid1
raidctl -c raid1.conf raid1     #configures the raid device
raidctl -A no raid1             #disables the autoconfigureing of the device
raidctl -v -R /dev/wd1e raid1   #reconstructs the failed component
raidctl -A yes raid1            #enables the autoconfigureing of the device.

#copy the base system from the working recovery partition to the 
#replacement drive.

mount /dev/wd1a /mnt
cd /mnt
tar cfX - -C / . | tar xvf - -C /mnt

#install the boot loader on the replacement drive
usr/mdec/installboot boot usr/mdec/biosboot wd1

#done and done 8)

reboot