Listing 2: Single system, online spare

#!/bin/sh
#  This script is designed to make a duplicate boot disk for zagloba .
#  and to prepare it so that it can be booted without switching the disk
#  ordering.

#  In the give credit where credit is due department, it is based on a 
#  script from Don Geitzen of Sun Microsystems (and tws).  Ron Jachim 
#  modified it for the Karmanos Cancer Institute to replicate their main 
#  server on demand.

#  Define the source (src) and destination (dst) disks
#  using standard SVR4 device names in the form cXtXdX.

src=c1t0d0
dst=c1t2d0

#  Determine the optimal block size based on the physical parameters
#  of the disk drives.  You will want to tune this for your disks.

HEADS=16
SPT=135
SECTORSIZE=512

BLOCKSIZE=`expr $HEADS \* $SPT \* $SECTORSIZE`b

#  Now copy the entire source drive to the destination drive.  Note
#  that this assumes that disk partition (slice) 2 is defined as the
#  entire disk drive.  This is the default for Solaris systems.

dd if=/dev/rdsk/"$src"s2 of=/dev/rdsk/"$dst"s2 bs=$BLOCKSIZE

#  Verify that all of the copied partitions are OK

fsck -y /dev/rdsk/"$dst"s0

#  Now mount the copied device and modify the /etc/vfstab to reflect
#  the destination disk as the boot disk so that all file systems will
#  be appropriately mounted during a real boot from the alternate
#  device.

mount /mnt

sed < /mnt/etc/vfstab -e s/$src/$dst/g > /tmp/vfstab.new
mv /tmp/vfstab.new /mnt/etc/vfstab

# Alternate boot device is now set up.  Unmount and exit.

umount /mnt
exit