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Upgrading from an older samba4 installation.

* Stop any samba process
* Backup your samba4 provision:
  go in the directory where your samba4 provision is stored (/usr/local/samba by default)
  do tar cf $HOME/backup.tar private (it's also recommended to save the etc/smb.conf and var/sysvol dir aswell)
* Go in the source4 dir
* run ./scripting/bin/upgradeprovision -s <path to smb.conf in samba4 install>
* do make install

This will do the minimum (safest) upgrade of the data.  

Runing upgradeprovision with --full will do a more comprehensive
upgrade of the data (including schema and display specifiers).  This
attempts to do a new provision, and to then copy existing data into
that database.