Using the lmdb database backend

LMDB back end

Samba can use an LMDB back end instead of the default TDB back end. The LMDB back end permits database sizes greater than 4Gb.

Enabling LMDB

The LMDB backend can be enabled when provisioning or joining a domain using the --backend-store=mdb option. The maximum size of the database files defaults to 8Gb, this can be changed with the --backend-store-size

This is a hard limit and Samba will fail if this limit is exceeded. There is currently no way to resize a Samba LMBD database.