RDF System Management Manual

Entering RDFCOM Commands
HP NonStop RDF System Management Manual—524388-003
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Command Overview
For extractors, receivers, and image trails, the configured ATINDEX value is displayed
in parentheses following the object name. In the above example, the extractor $RE00
and receiver $RR00 are associated with the MAT, while the extractor $RE01 and
receiver $RR01 are associated with auxiliary audit trail AUX01.
Because of insufficient space, however, ATINDEX values could not be displayed
explicitly for updaters. To determine the ATINDEX value of a particular updater, see the
ATINDEX value of the associated secondary image trail.
In this example, a monitor process and two extractor processes are configured on the
primary system, and two receiver processes and three updater processes are
configured on the backup system. For each process, the following items appear,
indicated by column headings near the top of the display:
RDF Process
The first column of the display identifies the type of process. Notice that each updater
process is identified by the names of both the primary volume the updater process is
protecting and the corresponding volume on the backup system. In this example, each
volume being updated on the backup system has the same name as the corresponding
volume on the primary system (for example, updates to the volume $DATA07 on the
primary system are duplicated by the updater process $RU02 to the volume $DATA07
on the backup system).
Name
The second column specifies the name of each process.
RTD Time
The third column (labeled RTD Time) specifies the current RDF time delay (RTD) value
for the extractor process, receiver process, and all updater processes. These values
can help you determine how far behind the application program each process is
running.
On the primary system, TMF attaches a timestamp to every commit and abort status
record generated for the application program. The extractor process, in turn, attaches
the most recent TMF commit/abort timestamp to all data modification image records.
The RTD value for each extractor is the difference between the “last modified time” of
the TMF master audit trail (MAT) and the timestamp in the most recent image record
processed by that extractor.
As each receiver processes records, it writes them to a buffer and then moves them
from the buffer as the need arises. Each receiver keeps track of the last audit record it
wrote to disk at the last save point; if the receiver must restart because the primary
system goes down, this save point becomes the receiver’s restart point. The RTD for a
receiver is the difference between the “last modified time” of the TMF MAT and the
timestamp that identifies the associated restart point.