I had the same sentiments, and some smaller harddrives.
It occured to me that it should be possible to mount drives under any dorectory you like. Since last night I now have a 39G server made up from a 2+8+9+19G set.
2G is the main disk where I installed the normal e-smith stuff, the rest is used for ibays (19G) music(9G) users(

. Ive just dumped the contents of my NT server in it, and all seems well!.
Since I'm still wet behind the ears as far as Linux is concerned, there might be issues here, that I have not discovered yet, so input from more knowledgable persons is highly appreciated!
This is my internal Howto:
I built a box with a 2G primary disk first and installed everything from a CD as usual. Once the install is completed, disconnect the cd. You now have 3 extra connections for ide drives. ( scsi is much easier of course)
Put all your fav. disks in the box and you are ready to go!
The directory structure is normally like this:
/home/e-smith/files/ibays
/home/e-smith/files/ibays/music
/home/e-smith/files/users
To add disks: ( from:
www.linuxnewbie.org/nhf/intel/hardware/hd_add.html)
connect the disk(s) to you motherboard and look at dmesg |more
see what the new disks are called.
mine were:
/dev/hdb /dev/hdc and /dev/hdd
You need to partition them. I choose a single partition per disk.
fdisk /dev/hdb
fdisk /dev/hdc
fdisk /dev/hdd
and create the partition with 'n'. don't forget to write it to the disk!
then
mkfs /dev/hdb1
mkfs /dev/hdc1
mkfs /dev/hdd1
make some directories under the / . I made 'ibays' and 'users'
( this is on the 2 G main disk)
mkdir users
mkdir ibays
copy the contents (should not be much) from /home/e-smith/files/ibays/
to /ibays/
same for users.. ( you end up with /home/e-smith/files/ibays/ibays, but
you have to keep the stuff in the original ibays somewhere, you can't (want)
keep the stuff in root.. think about it for a while..)
now use vi to edit /etc/fstab
my edited fstab now looked like this
LABEL=/ / ext2 defaults 1 1
LABEL=/boot /boot ext2 defaults 1 2
#/dev/hdb1 /home/e-smith/files/ibays/music ext2 defaults 1 1
/dev/hdc1 /home/e-smith/files/ibays ext2 defaults 1 1
/dev/hdd1 /home/e-smith/files/users ext2 defaults 1 1
/dev/cdrom /mnt/cdrom iso9660 noauto,owner,ro 0 0
/dev/fd0 /mnt/floppy auto noauto,owner 0 0
none /proc proc defaults 0 0
none /dev/pts devpts gid=5,mode=620 0 0
/dev/hda5 swap swap defaults 0 0
do a: mount -a
and bingo.. all is well.
manually copy the files in ibays to the right place.
now create users, ibays etc..
Please note the asterix in front of hdb1
Since the music drive is mounted under the other one, you can not mount them at the same time the first time around. It's simply a matter of doing a mount -a twice, and editing the fstab in between. This is only a one-time affair.
I'm still tinkering with all this, but it looks good. Also maybe an idea not to create any users or ibays until you've done the setup.
Not quite an automatic install, but it does give my old drives a good home!