RDF/IMP and IMPX System Management Manual (RDF 1.4+)

Installing and Configuring RDF
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
3-3
Preparing the Backup System
replicate everything else that is not audited, such as important application files, objects,
and scripts.
If the names of any volumes or devices the applications might use on the backup
system are different from the names on the primary system, you must also change any
references to these volumes or devices.
It is strongly recommended that the backup system have one volume for every volume
protected by RDF on the primary system and that each backup volume have the same
name as the corresponding primary volume. If the backup volume names are not
identical to the primary volume names, then you need to update every backup
partitioned file and every backup file that has alternate keys so that each points to the
right volume name. Also, if you replicate two or more volumes on the primary system
to a single volume on the backup system, the updaters might fall behind under very
high throughput due to the double workload.
RDF requires that TMF be started on the backup system, the database on the backup
system resides on configured data volumes, the data volumes be physically up, and
the files and tables be audited. BEGINTRANS should be enabled. SMF disks should
be audited. If replicating SQL Format 2 audit data, be sure the backup system supports
it.
For NonStop SQL databases, you must create SQL catalogs on the backup system
and you need copies of the following objects on the backup system:
•
Catalogs in which base tables protected by RDF and objects dependent on those
base tables are registered, preferably with the same names as the primary system
catalogs
•
All base tables that reside on primary system volumes protected by RDF
•
All views and indexes dependent on base tables protected by RDF
•
All program files for applications that use any base tables protected by RDF if you
want the applications to run at the backup site after an RDF takeover operation
The backup system should also have copies of the following files in case an RDF
takeover operation is necessary:
•
OBEY command files and TACL scripts containing NonStop SQL DDL commands
that define the database
•
SQLCI report definitions
To make it easy to compare catalogs on the primary and backup systems, it is strongly
recommended that you register objects protected by RDF in separate catalogs from
objects not protected by RDF. Either all the tables in a catalog should be protected or
none of the tables should be protected.
Every NonStop SQL object maintained on the backup system must be registered in a
catalog, even if the object is not protected by RDF.