Process Priority; Ems Logs (Collectors); Retaincount; Purgetime - HP NonStop RDF J-series RVUs Management Manual

To change any of the attribute values listed above, you start RDFCOM and use the ALTER
command. ALTER is a restricted command; it can be issued only by members of the super-user
group. See the description of the ALTER command in

Process Priority

All configured RDF processes should run at a priority greater than that of any application process.
Furthermore, the RDF processes should run at priorities relative to one another:
• On the primary system, the monitor and extractor processes can run at the same priority
but it is recommended that you set the extractor's priority slightly lower than that of the
monitor.
• On the backup system, the receiver process should run at a higher priority than any updater
process.
The STATUS RDF display shows the priority at which each RDF process is running. Suppose
this display indicates that the monitor currently runs at a priority of 165. To change its priority
to 170, use the ALTER command:
]ALTER MONITOR PRIORITY 170

EMS Logs (Collectors)

In an RDF configuration, two EMS logs (collectors) exist: one at the primary system and the other
at the backup system. The log on the primary system is used by the monitor, RDFCOM, and
extractor and RDFNET processes. The log on the backup system is used by the receiver, updater,
and purger processes.
To redirect messages from the current EMS log to the log named $EMSC (on the control subvolume
CHICAGO), enter:
]ALTER RDF LOGFILE $EMSC
The specified collector must reside on the local system. For example, if you are in an RDFCOM
session on the system \SANFRAN, you cannot specify something like \CHICAGO.$EMSC as
the log.
For more information about the EMS log, see
(page 187), and

RETAINCOUNT

The RETAINCOUNT purger process configuration attribute specifies how many image trail files
must be retained on disk for each image trail.

PURGETIME

The PURGETIME purger process configuration attribute specifies the number of minutes the
purger process waits between attempts to purge redundant image trail files. Altering this attribute
causes the purger to perform a purge pass immediately.

UPDATERDELAY

The UPDATERDELAY global configuration attribute specifies how many seconds the updater
processes should delay upon reaching the logical EOF in the image trail before attempting a new
read.

UPDATEROPEN

The UPDATEROPEN global configuration attribute specifies how the updaters open database
files. By default it is PROTECTED, but PROTECTED OPEN and SHARED are alternatives. See
the discussion on UPDATEROPEN in
change UPDATEROPEN online, the updater closes all its files and then restarts using the new
UPDATEROPEN attribute.
Chapter 9 (page 261).
Chapter 8 (page
Chapter 1 (page
Chapter 3 "Installing and Configuring
Performing Routine Operational Tasks
187).
31), Chapter 3 (page 69),
RDF". When you
Chapter 8
117