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
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Configuring RDF
To add one secondary image trail to the volume named $IMAGA1 and another to the
volume named $IMAGA2, issue the following commands:
]ADD IMAGETRAIL $IMAGA1
]ADD IMAGETRAIL $IMAGA2
Purger Process
Use SET PURGER and ADD PURGER commands to configure the following purger
parameters:
•
CPUS primary-CPU : backup-CPU
•
PRIORITY
•
PROCESS
•
RETAINCOUNT
The CPUS option value specifies the processors in the backup system in which the
purger is to run.
The PRIORITY option value specifies the priority at which the purger will run. You
should set the purger’s priority higher than that of any application’s process and higher
than that of any RDF updater process.
The PROCESS option value, if present, supplies a name for the purger process. If you
choose to name the purger, you should specify a meaningful mnemonic such as $PURG.
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.
If you omit the PROCESS option, the operating system selects a name for the purger
process.
The RETAINCOUNT option value specifies how many of the most recent image trail
files will be retained on disk for each image trail. This parameter is only relevant with
the triple contingency feature. The default value is 2. For details about the
RETAINCOUNT parameter and triple contingency, see Section 10, Triple Contingency
.
To configure an RDF purger process named $PURG to run as a process pair in CPUs 0
and 2 of the backup system at a priority of 185, and to ensure that at least six image trail
files are always retained on disk, issue the following commands:
]SET PURGER PROCESS $PURG
]SET PURGER CPUS 0:2
]SET PURGER PRIORITY 185
]SET PURGER RETAINCOUNT 6
]ADD PURGER