Summary
Data Protector backups to a StoreOnce device fail
"Number of devices used is smaller than MIN value of load balancing."
Question
Data Protector backups to a StoreOnce device fail with
"Number of devices used is smaller than MIN value of load balancing."
"Number of devices used is smaller than MIN value of load balancing."
Answer
In this case the problem was because there wasn't a correctly working gateway.
The client machines could not resolve the Gateway's hostname.
Entering the Gateway's hostname/ip address in the client's host file,
so clients could resolve the gateway, fixed the problem.