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
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Configuring RDF
Although such operations can be performed on the primary system without stopping
your applications, they must be performed manually on the backup system after all
updaters have shut down in response to the same Stop-RDF-Updater record.
As a general rule, you should not initialize RDF to an inittime if you recently
performed a SQL operation with SHARED ACCESS on the primary system. For
example, suppose you have a SQL table (tableA) that contains the range of keys A
through Z and you just moved its partition boundary such that tableA now contains only
the keys A through M and a new table (tableB) contains the keys N through Z.
Suppose also that you performed this operation manually on the backup system.
If you then initialize RDF to a point in the MAT prior to the Stop-RDF-Updater record
associated with the partition boundary change and an updater encounters audit
information associated a key N through Z, the updater will report an error because it
will try to apply the audit information to tableA (which used to contain it, but now does
not), and the audit information will not be applied to the backup database. In this
particular case, the database is not corrupted, but data corruption could happen for
other SQL DDL SHARED ACCESS operations.
If you did recently perform an SQL operation with SHARED ACCESS on the primary
system and you want to initialize RDF to a inittime , you should wait before issuing
the command until you can specify an inittime that includes the three minutes
added by RDFCOM so that the starting position in the MAT is after the Stop-RDF-
Updater record.
As a precaution, if RDFCOM encounters a Stop-RDF-Updater record during its
backward search of the MAT, it issues a warning message asking if you want to
proceed with initialization. Note that if you continue the operation, the updaters will shut
down when they encounter the Stop-RDF-Updater record, at which time you should try
to perform the SQL DDL operation manually again on the backup system.
TMF Shutdown Records
TMF shutdown records in the MAT do not cause a problem, except that RDF shuts
down and you must then restart it.
Configuring RDF
For RDF to operate correctly, you must establish values for the following sets of
parameters in the RDF configuration file:
•
Global parameters that apply across RDF
•
Process parameters that apply to the individual monitor, extractor, receiver, purger,
updater, and RDFNET (if an RDF network master) processes, and to the image
trails
In addition to the configuration file on disk, RDFCOM maintains a copy in memory. To
configure RDF, first use RDFCOM SET commands to establish the values you want in
the configuration memory table, and then use ADD commands to apply those values
to the configuration file. You do this for each process individually; do all of the SETs