OSI/MHS Configuration and Management Manual

OSI/MHS Configuration and Management Manual—424827-003
G-1
G
Remote Duplicate Database Facility
(RDF) Support
The Remote Database Facility (RDF) product allows customers who have computer
systems at multiple sites to safeguard their OSI/MHS transactions and database if
disaster strikes at a particular location. When customers use RDF, an alternate site can
take over from the damaged site in minutes or seconds, thus avoiding a lengthy
resource outage.
RDF monitors Transaction Management Facility (TMF) transaction activity on a
database resident on a primary system and applies duplicate updates to an identical
copy resident on a remotely located backup system within the same network. RDF
continually updates the backup database, providing a current online copy of the
primary database. The backup database can be located nearby or across the
continent. Thus, RDF can protect against area-wide or even regional disasters.
RDF can also be useful during normal operations; for example, it can cause the
backup system to take over OSI/MHS operation when a planned shutdown of the
primary system occurs.
Using RDF with the OSI/MHS requires that you perform the installation, configuration,
and operational tasks enumerated and briefly described in this section. For full
information about how to install, configure, and manage RDF, see the Compaq
NonStop™ RDF/IMP and IMPX System Management Manual in the Independent
Product TIM collection.
The installation, configuration, and operational tasks include:
1. Installing RDF on both the primary and backup systems
2. Stopping the OSI/MHS subsystem on the primary system
3. Configuring TMF in both the primary and backup systems
4. Initializing and configuring the RDF subsystem on the primary system
5. Ensuring that TMF is started on the backup system
6. Copying database files from the primary to the backup system
7. Created a file named QFILES on the backup system.
8. Running the MHSINST macro on the backup sytem
9. Enabling RDF operations by restarting the TMF subsystem, starting the RDF
subsystem, and restarting OSI/MHS in the primary system.
The appendix also explains how to recover from a primary system failure or shutdown
(see Performing Disaster Recovery on page G-3.)