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

Operating and Monitoring RDF
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
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Displaying Current Configuration Parameters and
Operating Statistics
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NSA Stop Update pending
•
Update NSA stopped
The rest of the display provides current information about each RDF process configured.
For extractors, receivers, and image trails, the configured ATINDEX value is displayed
in parentheses following the object name. In the above example, the extractor $RE01
and receiver $RR01 are associated with the MAT, while the extractor $RE02 and
receiver $RR02 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 identifies the type of process. Notice that each updater process is
identified by the names of the primary volume the updater 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 denotes the name assigned to the process.
•
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 applications 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.
The RTD value reported for each updater process is the difference between the “last
modified time” of the TMF master audit trail (MAT) and the timestamp in the most
recent image record seen by the particular updater.