Description of problem:

mount.glusterfs and mount -t glusterfs do not give specific error messages, making it difficult to troubleshoot the issue. The request is for more information to be given by default, without needing to set DEBUG level logging.

From the customer:

"It ends up with 'mount failed' on any problem. Doesn't matter if it's a firewall problem, client cannot connect node:brick port or it's just denied via auth.allow volume option. Client log messages is not telling you any usable if error level is set to ERROR. 

Connection problems (cannot connect to brick port) are visible only with DEBUG level enabled. I think that mount/connections error should be clearly logged as:

Mount failed - client not allowed in auth.allow
Mount failed - cannot connect server:port
etc..."

Please let me know if any further information is required for this RFE. Thank you.