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

Entering RDFCOM Commands
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
8-11
Command Overview
The master image trail identified by the RDFVOLUME parameter in the SET
RECEIVER command is reserved for use by the receiver process. All updaters must be
configured to secondary image trails. Each image trail is stored on a separate volume on
the backup system. To add a secondary image trail, you specify the disk volume
intended for its use through the ADD IMAGETRAIL command. When you configure
your individual updater processes with the SET VOLUME command, you assign each of
these processes to a different image trail, reducing the number of updaters contending
for a specific trail.
Each secondary image trail contains only that audit data required by the associated
updaters. Image files in secondary image trails have the same extent sizes as image files
on the volume specified by RDFVOLUME. Because the extent sizes for secondary
image trails are obtained from the receiver’s configuration record, you do not specify
them through any RDFCOM commands.
With RDF/IMP and IMPX, if your RDF configuration is not particularly small (say, 30
volumes or more) and your performance requirements are not high, you can assign one
image trail per updater process, and you can place that image trail on the updater’s
UPDATEVOLUME. If you have the need for high performance, however, even on a
small system, it might be best to have a dedicated volume for your image trails.
You cannot add secondary image trails until you have configured the receiver, because
the extent sizes for these trails depend on those specified for the receiver’s master image
files.
Examples
To configure the extractor process to run in CPUs 0 and 1 at the default priority of 165
with the default RTD warning threshold of 60 seconds, enter the following commands:
]SET EXTRACTOR CPUS 0:1
]ADD EXTRACTOR
Because a SET EXTRACTOR PROCESS command was not issued, the operating
system automatically supplies a default name for the extractor process.
To define \RDF003 as the backup system and $BSWAP as the backup system swap
volume, enter the following commands:
]SET RDF BACKUPSYSTEM $RDF003
]SET RDF BACKUPSWAP $BSWAP
]ADD RDF
When the preceding command sequence is executed, all of the other RDF global
parameters are set to their default values, as follows. (In this list, \LONDON is the
system at which you issued the command sequence.)
PRIMARYSYSTEM: \LONDON
PRIMARYSWAP: $SYSTEM
CONTROL SUBVOLUME: LONDON
SOFTWARELOC: $SYSTEM.RDF
LOGFILE : $0
UPDATERDELAY: 10
UPDATEROPEN: PROTECTED