mmgetstate -a lists all nodes in unknown state

After I setup the GPFS NSD Nodes, I did a "mmgetstate -a", I noticed that my NSD Nodes shows all the compute nodes in an unknown state.

# mmgetstate -a 
.....
.....
node1    unknown
node2    unknown 
node3    unknown
.....
.....

There are a lot of reasons why "mmgetstate -a" produce the unknown state. For my case, it was a simple resolution, it was just that my /etc/hosts file was not updated. After I updated the /etc/hosts file for all the NSD Node, my solution was fixed.