HP CIFS Server Administrator's Guide Version A.03.01.02 (5900-1766, September 2011)

Backup Domain Controllers
Advantages of Backup Domain Controllers
HP CIFS Server with BDC support provides the following benefits to the customer:
• The BDC can authenticate user logons for users and workstations that are members of the
domain when the wide area network link to a PDC is down. A BDC plays an important role
in both domain seurity and network integrity.
• The BDC can pick up network logon requests and authenticate users while the PDC is very
busy on the local network. It can help to add robustnees to network services.
• The BDC can be promoted to a PDC if the PDC needs to be taken out of services or fails. This
is an important feature of domain controller management. To promote a BDC to a PDC on
the HP CIFS Server, change the domain master parameter from "no" to "yes".
Limitations
The following is a list of limitations for the BDC support:
• HP CIFS Server can only function as a BDC to an HP CIFS PDC.
• HP CIFS Server and MS Windows server can each function as a BDC to its own type of PDC.
• HP CIFS Server cannot create Security Account Management (SAM) update delta files. It
cannot interoperate with a PDC to synchronize the SAM from delta files that are held by a
BDC.
• The Samba 3.0 BDC does not support replication to a PDC. Running a Samba 3.0 BDC with
a non-LDAP backend can have the difficulty in synchronizing the SAM database. Refer to
Table 5.1, Domain Backend Account Distribution Option, in the Official Samba HOWTO and
Reference Guide for more information on possible design configuration for a PDC/BDC
infrastructure.
Domain Members
• The following member servers are supported:
Windows NT◦
◦ Windows 2000 and Windows 2003
◦ HP CIFS Server
• Users on a domain member machine can access network resources within the domain. Some
examples of these resources are file and printer shares and application servers
• Domain members do not perform the user authentication for user logons. Instead, the member
sends the credentials to a domain controller via a secure channel. The domain controller
checks the credentials against those in its database and returns the results to the member
server. Access is granted based on the results returned
Configure the HP CIFS Server as a PDC
When configured to act as a Primary Domain Controller (PDC), the HP CIFS Server should create
machine accounts for Windows Clients (member servers). To enable this feature, choose "Primary
Domain Controller" when executing samba_setup, then verify the following:
1. The smb.conf file is as shown if the HP CIFS Server acting as a PDC does not use the LDAP
backend:
[global]
workgroup = SAMBADOM #Samba Domain
security = user
Configure the HP CIFS Server as a PDC 55