CMMVC9389E The command failed because there are already max iSCSI (initiator + target) sessions present on node.
Explanation
This error can occur when an attempt is made to establish more than 1024 iSCSI connections on a node, including host attachment and external storage connections.
User response
Remove unneeded iSCSI connections, and then retry the command. You might need to remove host attachment connections to create more iSCSI connections to external storage.