<para>
In contrast to read only backends like idmap_rid, it is an allocating
backend: This means that it needs to allocate new user and group IDs in
- order to create new mappings. The allocator can be provided by the
- idmap_tdb backend itself or by any other allocating backend like
- idmap_ldap or idmap_tdb2. This is configured with the
- parameter <parameter>idmap alloc backend</parameter>.
- </para>
-
- <para>
- Note that in order for this (or any other allocating) backend to
- function at all, the default backend needs to be writeable.
- The ranges used for uid and gid allocation are the default ranges
- configured by "idmap uid" and "idmap gid".
- </para>
-
- <para>
- Furthermore, since there is only one global allocating backend
- responsible for all domains using writeable idmap backends,
- any explicitly configured domain with idmap backend tdb
- should have the same range as the default range, since it needs
- to use the global uid / gid allocator. See the example below.
+ order to create new mappings.
</para>
</refsynopsisdiv>