RDF System Management Manual

HP NonStop RDF System Management Manual—524388-003
12-1
12 Auxiliary Audit Trails
In addition to the master audit trail (MAT), RDF/IMPX and ZLT support protection of up
to 15 auxiliary audit trails.
If you want to protect data volumes associated with an auxiliary audit trail, you must
configure an auxiliary extractor and an auxiliary receiver for that trail. Thus, for each
auxiliary audit trail, there will be one auxiliary extractor-receiver pair.
Auxiliary Extractor
An auxiliary extractor can only be configured to a single auxiliary audit trail. Such an
extractor will read only the designated auxiliary audit trail; it will never read any part of
the MAT or any other auxiliary audit trail. When reading the audit trail, it looks for any
audit records associated with the pool of volumes being protected by RDF (normal
filtering logic). All such records are sent to the backup system in accordance with
standard RDF architectural behavior. Each auxiliary extractor is associated with a
corresponding auxiliary receiver through the user-specified configuration. The auxiliary
extractor communicates only with that particular auxiliary receiver, and never sends
data to the master receiver or any other auxiliary receiver.
Auxiliary Receiver
An auxiliary receiver is associated with a specific auxiliary extractor. Because the
auxiliary extractor sends audit records associated only with its particular auxiliary audit
trail, the corresponding auxiliary receiver writes audit records to the image trails of
updaters associated only with volumes configured to the particular auxiliary audit trail.
For example, assume that $DATA1 on the primary system is configured as a data
volume in auxiliary audit trail AUX01, and an auxiliary extractor is configured for
AUX01. The auxiliary extractor sends all audit information for $DATA1 to a
corresponding auxiliary receiver on the backup system. The receiver writes the data to
an image trail that is, in turn, read and processed by an updater responsible for
replicating database changes for $DATA1.
Configuring Extractors and Receivers
The SET EXTRACTOR and SET RECEIVER commands include the following optional
syntax:
ATINDEX atindex
where atindex is an integer value corresponding to the audit trail number of the MAT
(0) or an auxiliary audit trail (1 through 15) on the primary system. The default is 0.
Because 0 is reserved for the MAT, the extractor and receiver with an atindex value
of 0 are the master extractor and receiver. The extractors and receivers with atindex