This boolean parameter is only available if Samba has been configured and compiled with the option --with-utmp. If set to yes then Samba will attempt to add utmp or utmpx records (depending on the UNIX system) whenever a connection is made to a Samba server. Sites may use this to record the user connecting to a Samba share.
Due to the requirements of the utmp record, we are required to create a unique identifier for the incoming user. Enabling this option creates an n^2 algorithm to find this number. This may impede performance on large installations.