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Setting up linux cluster - need help



Title: Message
I am trying to setup a linux cluster using two nodes, an external SCSI storage, and RedHat Advanced Server ver 2.1.
 
My scsi adapter on both nodes is ADAPTEC 29160N.
 
After installing both nodes,
 
I notices that once node A is up, it is able to access the SCSI drive (using: fdisk /dev/sda).
Once node B is up, it "steals" the SCSI drive, and it is no longer available to the node A.
running fdisk again on the first node - hangs.
 
When I try the node B to start first, node A steals it after it comes up second...
 
Appreciate your help,
Nir