Explanation
If volume protection is enabled and the host port
being deleted is the last port for a host mapped to any volume which
has received I/O within the defined volume protection time period,
the command will fail.
The same behavior applies for rmhost:
the policing will allow the last host port to be removed if the host
is already offline and there is another host mapped to the volume.
User Response
Ensure no host I/O is being sent to the volumes and
ensure you have waited for the defined volume protection time period
or disable volume protection.