[Linux-cluster] fence device: network card?

[Karl R. Balsmeier]

Hi,

I have three (3) servers built and entered into the 
system-config-cluster tool as nodes.  Basically the first node has node 
2 and node 3 as members of the cluster.

For a fence device, I do not have any of the SAN or network/switch 
devices listed in the dropdown menu, and where I have read in the 
documentation that says "gnbd" Generic Network Block Device seems to be 
what i'm looking for.

Basically I read in the docs you can use a NIC card as a fence device, 
is this true?

Right now each of the 3 servers have 3 NICs, so I have a total of 9 to 
play with.  Right now I am bonding the two GB NIC's together no 
problem.  That leaves each server a 100mbps NIC.

My ultimate goal is to use these 3 machines to make a Vsftpd GFS cluster 
that I can run Iscsi over. 

Being new to this though, i'll stick to the primary questions:  How does 
one configure a fence device in the form of a NIC card?  Is the gnbd 
item relevant to this?

-karl