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

Entering RDFCOM Commands
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
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Command Overview
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.
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.
The RTD value reflects, in the most general sense, the amount of time by which the
backup database is lagging behind the primary database. In the example shown under
“Output Displayed” earlier in this command description, the specified RTD time for the
updater $TU04 is 0 minutes and 10 seconds, meaning that the updater is running
approximately 10 seconds behind the MAT.
On a finely tuned RDF backup node, the RTD for an updater can regularly lag 1 to 15
seconds behind TMF processing. However, this 15-second delay does not mean that
15 seconds are needed to catch up; that operation may only a few seconds.
If RDFCOM cannot connect to a particular process, RDFCOM displays dots (...) in the
RTD Time, Sequence, and RByte Addr fields and an appropriate File System error
number in the Error field.
Pri
The fourth column specifies the priority at which each process is running.
Volume and Seqnce
The fifth and sixth columns together specify a file associated with each process, as
follows: