RDF/IMP, IMPX, and ZLT System Management Manual

Installing and Configuring RDF
HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002
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Configuring RDF
Purger Process
Use SET PURGER and ADD PURGER commands to configure the following purger
parameters:
•
CPUS primary-CPU : backup-CPU
•
PRIORITY
•
PROCESS
•
RETAINCOUNT
•
PURGETIME
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 supplies a name for the purger process. 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 HP reserved process names that are of the form $X*, $Y*, or $Z*, in
which * is any alphanumeric string.
The RETAINCOUNT option value specifies how many of the most recent image trail
files will be retained on disk for each image trail. The default value is 2. For details
about the RETAINCOUNT parameter and triple contingency, see Section 10, Triple
Contingency.
The PURGETIME option value specifies the number of minutes the purger process
waits between attempts to purge redundant image trail files. The default value is 60.
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
]SET PURGER PURGETIME 30
]ADD PURGER
You cannot start RDF until you have configured a purger process.
You can issue ADD PURGER commands only when RDF is stopped.