Recently when playing around with caa utilizing SSP (Shared Storage Pools) I can across an issue when attempting to add a node to an existing cluster. The exact errors when adding the node is:
cluster -addnode -clustername test -hostname testvm1.example.com
WARNING: Could not establish a socket connection to node testvm1.example.com.
WARNING: Could not establish a socket connection to node testvm1.example.com.
The given request has been partially succeeded.
Check cluster status for issues with cluster services for the added node.
testvm1.example.com
After doing some playing around with contacting IBM and waiting for over 48 hours for a response, started to look around. Using a tcpdump it appeared to have something to do with caa_cfg not listening properly.
Doing some googling, and was able to find this URL.
Once the relevant sub-systems were enabled, the system could add the node. However, you first need to remove the node with:
cluster -rmnode -clustername test -hostname testvm1.example.com