RDF/IMP and IMPX System Management Manual (RDF 1.3+)

Introducing RDF
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
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.
Note that in this example each receiver process writes all audit information to a single
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
Image
Trail
Master
Audit
Trail
PROTECTED
$UP11 – $UP15
$D11 – $D15
AUX01
Audit
Trail
$D11 – $D15
Receiver
Auxiliary
Extractor
Auxiliary
Updaters
Updaters
AUX01
Image
Trail