It seems my hub is unresponsive. Zwave repair failed all nodes
What are the actual symptoms you're experiencing? Is there a reason you tried a Z-Wave repair? While it should work (if they are powered nodes), it's normally not a good idea to try a network-wide repair like this, especially if you are experiencing problems, as it's a chatty endeavor and could make things worse.
One thing that might help if you are having troubles is a complete shut down and restart of the Z-Wave radio, which requires special steps as detailed at the end of this document:
Hub model, platform version, and Z-Wave radio firmware version (really just whether you have a "Firmware Update" button on the Z-Wave Details page) would also be good to know.
That worked. I had to reboot again the hub because it showed severe load. The second reboot cleared that up.