Device names on hotswap server. (Name by port rather than insert order?)
Rather than rely on device names being always the same, why not use filesystem labels? Those are a lot easier to deal with.
To set a label on a partiton (ext2/3/4 in this case):
$ e2label /dev/sda1 FOOBAR
Then in /etc/fstab:
LABEL=FOOBAR /mnt/foobar ext3 defaults 0 0