Classic SFU-compliant zones (version 4.0)
if you have the Microsoft Services for UNIX (SFU), version 4.0, schema extension installed, you have the option of using SFU-compliant zones for storing data. Centrify SFU-compliant zones for the Microsoft Services for UNIX (SFU), version 4.0, schema extension are similar to SFU-compliant zones for version 3.5, except that Microsoft Services for UNIX (SFU), version 4.0, uses the R2 schema. The UNIX‑specific attributes for users and groups are still stored in the actual Active Directory user and Active Directory group objects, but use the R2 schema attributes instead of the msSFU* attributes used in Microsoft Services For UNIX (SFU), version 3.5.
Note: You can only create this type of zone if the R2 schema is installed. If the R2 schema attributes are not available, you cannot create this type of zone.