If the remote host in a multinode setup is not up, then the Disks/Pools view in the WebUI does not show anything. The REST-API call results the following:
Pool Proxy List
HTTP 500 INTERNAL SERVER ERROR
Allow: GET, POST, HEAD, OPTIONS
"detail": "HTTPConnectionPool(host='192.168.10.122', port=80): Max retries exceeded with url: /openattic/api/pools/4 (Caused by <class 'socket.error'>: [Errno 113] No route to host)"
Such a situation should be handled in some way, e.g. by showing as much information as possible with a hint that the remote system is down (via hint in the 'Status' column).