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

Introducing RDF
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
1-3
RDF Subsystem Overview
In Figure 1-1, there are 20 audited volumes on the primary system ($D1 through
$D20). Only volumes $D1 through $D15, however, are configured for RDF protection.
Audit information for volumes $D1 through $D10 and $D16 through $D20 is sent to the
master audit trail (MAT). The RDF master extractor process reads the MAT and sends
audit information associated with volumes $D1 through $D10 to the RDF master
receiver process on the backup system.
Audit information for volumes $D11 through $D15 is sent to the auxiliary audit trail. The
RDF auxiliary extractor process reads the auxiliary audit trail and sends audit
information associated with volumes $D11 through $D15 to the RDF auxiliary receiver
process on the backup system.
The master receiver writes transaction status information to the master image trail.
Note that in this example each receiver process writes all audit information to a single
secondary image trail. As will be discussed later, however, either could write to multiple
sorted image trails.
Figure 1-1. Basic RDF Configuration
Primary
System
PROTECTED
NOT
PROTECTED
Backup
System
001CDT .CDD
Extractor
Master
Receiver
Master
Purger
Monitor
RDFCOM
$D1 – $D10
$UP1 – $UP10
$D1 – $D10
$D16 – $D20
Master
Audit
Trail
PROTECTED
$UP11 – $UP15
$D11 – $D15
AUX01
Audit
Trail
$D11 – $D15
Receiver
Auxiliary
Extractor
Auxiliary
Updaters
Updaters
AUX01
Master
Image
Trail
Secondary
Image
Trail
Secondary
Image
Trail