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

Installing and Configuring RDF
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
3-22
Configuring RDF
UPDATERTXTIME Parameter
The UPDATERTXTIME parameter specifies the maximum transaction duration in
seconds (from 10 to 300) for all updater processes. The default is 60 seconds.
RDF updaters operate in transaction mode. Updater transactions are essentially long-
running transactions that pin audit trail files on the backup system and can affect the
duration of backout operations if an updater transaction aborts for any reason.
The default value is recommended for RDF environments with heavy updater activity
(aggregate updater throughput greater than 300 kb/second). Raising the
tx-time in
such environments could adversely affect TMF performance on the backup system.
In RDF environments with low to moderate updater activity and where no other
transaction activity is occurring on the backup system, you could raise the
tx-time
without affecting TMF performance on the backup system.
Setting Individual Process Parameters
Having set the global parameters, you are now ready to set the parameters that apply
to individual RDF processes: the monitor, extractor, receiver, purger, and updater
processes.
Monitor Process
Use SET MONITOR and ADD MONITOR commands to configure the following
monitor parameters:
•
CPUS primary-CPU : backup-CPU
•
PRIORITY
•
PROCESS
The CPUS option value in the following form specifies the primary and backup
processors in which the monitor will run:
CPUS primary-CPU:backup-CPU
If the primary processor is not available when RDF is started, the monitor executes in
the specified backup processor without benefit of a backup process. When the primary
processor is brought back online, the monitor creates its own backup process in the
primary processor and then switches control to that monitor process.
The PRIORITY option value specifies the priority at which the monitor will run. You
should set the monitor’s priority higher than that of any application’s process.
The PROCESS option value, if present, supplies a name for the monitor process. If you
choose to name the monitor, you should specify a meaningful mnemonic such as
$AMON or $MON1. The process name can be any unique valid process name up to 5
characters, including the $ symbol. However, you cannot specify Compaq reserved
process names that are of the form $Xddd, $Yddd, or $Zaaa, in which d is any
numeric character and a is any alphanumeric character.