When running the Vertica Data Repository backup it fails and reports the following error message.
Error: Timed out connecting to rsync daemon on host <nodeHostName>.
All supported CA Performance Management releases
A common cause for this is related to previously failed attempts to run the backup job. When it fails there are often broken rsync connections on the database cluster nodes.
These rsync connections are started by a parent process. When that process dies and breaks the connection the rsync processes are left with a child PID but a parent PID that no longer exists.
This leaves these processes in a disowned zombie state where they require manual shut down.
These prevent new rsync connections from being successfully created and trigger the error message observed.
Pay special attention in a multi-node cluster to each member of the cluster. If one cluster is missed and still has zombie rsync processes left over the backup will fail again.