Sharing Disks Between Two Servers?

I was looking to basically cluster two DL360 G5 servers for the purposes of storage. Here is the scenario: 

Server A has 6 disk drives. 

Server B has 6 disk drives. 

I would allocate two drives from Server A for its own OS. 

I would allocate two drives from Server B for its own OS. 

Then I want to take the remaining four drives from each server and make ONE logical drive out of all eight of them so that BOTH servers could share it as one drive. 

Can this be done if I put fibre channel cards in both servers and join them together? Or some other connection between the two? 

THANKS!