The NBRB_MPX_GROUP_UNLOAD_DELAY entry serves as a performance tuning option for the Intelligent Resource Manager.

This entry indicates the number of seconds that the NetBackup Resource Broker (nbrb) waits for a new job to appear before a tape is unloaded. This setting can help avoid unnecessary reloading of tapes and applies to all backup jobs.

The default is 10 seconds.

During user backups, nbrb uses the maximum value of NBRB_MPX_GROUP_UNLOAD_DELAY and the Media mount timeout host property setting when nbrb unmounts the tape.

This host property is found in the NetBackup Administration Console under NetBackup Management > Host Properties > select master server > Timeouts > Media mount timeout.

During restores, Media mount timeout is used, not NBRB_MPX_GROUP_UNLOAD_DELAY.

No equivalent for NBRB_MPX_GROUP_UNLOAD_DELAY exists in the NetBackup Administration Console host properties.