Red Hat :: Move Var Which Is On The 8MB ROM To Hard Disk?

how to move var which is on the 8MB ROM to Hard disk? I have following scenario:

1/ On IBM powerPC with 8MB ROM and 64MB RAM

2/ Entire Linux 2.6.9 OS with application the image size is 5.1MB

3/ The image get flashed in to ROM and creates var directory on ROM area

4/ Recent upgrade with Hard drive for 60GB gave more storage power

5/ Hence, moving var on to hard disk IS first priority, so var store larger size of data and log, following is snapshot of content on ROM

Code:

bin etc lib proc sbin sys var
dev hdd mnt root share tmp var_init

My goal is ....

1/ Move var to hard disk with all its contents

2/ the IDE hard disk recognised by OS as hdd and mounted in ROM as directory

3/ Once var is moved on the hard disk then OS should look for all setting and data, log etc on hard drive based var directory hence kernel must look for all necessary files on hdd/var directory

4/ The original var could be remain on ROM but made empty and not to be used by OS.

5/ The entire OS on ROM area is READ only and cannot be deleted i.e. var directory hence only var contents moved to hdd/var directory.

6/ The file /etc/fstab is completely blank with zero size.