Appending a HD

[parrecho]

Hi: I just added a second hard drive to my Linux box, and I will like to know if it is possible to add this newly empty space to the existing  hd (the first hd). Using the parted utility.

My first hd is a 4.gb and It has 3 partitions on it.. /dev/hdd1 the boot partition about 217 mg, /dev/hdd2 the swap partition about 2 gb ( I have 1 gig of ram), and /dev/hdd3 that holds the / partition about 2 gb.

As of right now I do not have any app data files, just system files, and I do not have much space left on the first drive, I added/formatted a 6.gb hd, it is called dev/hdb1 I formatted it as a single partition, already updated the etc/fstab file, I created a directory called new on this second hd, and it is mounted, now how do  I tell Linux to go ahead and use this drive?

? It is possible to have 2 root partitions? one on each drive?

Can I resize the whole / partition so it will take the extra space on the second drive?

I am using rh v9, I am new at this (Linux), I have asked on the Linux forums and I received a lot of different answers, hopefully you can guide me in the right direction

TIA

Miguel