CP6100 I/O Process Programming Manual

Using CP6100: Managing Lines
and STARTDOWN configuration parameters. Some managers make
a practice of defining extra lines, so that a SYSGEN won't
be required every time a new line is installed. By
setting the STARTBOOT and STARTDOWN parameters, you prevent
the system from trying to download an LIU that isn't there.
• Several parameters you define in SYSGEN affect the way CP6100
responds to component failures. AUTOLOAD causes CP6100 to
download the LIU if a status probe reports an LIU failure,
other than a power-on condition. (CP6100 does a status
probe every 10 seconds if the LIU hasn't transferred data
within those 10 seconds. A probe is transparent to
applications unless a failure occurs.) NOAUTOLOAD causes
CP6100 to declare the line down in the same cases. AUTOLOAD
applies by default.
AUTOCLOSE causes CP6100 to close all opens of a line whenever
the LIU is downloaded. Applications must close and reopen the
line to use it again. If NOAUTOCLOSE is in effect, CP6100
doesn't close the line; applications continue their use of the
line without reopening it. AUTOCLOSE applies by default.
NOAUTOSTOP prevents CP6100 from sending a STOP request to the
protocol after all opens of a line have been closed. By
default, CP6100 sends a STOP request. The effect of a STOP
request varies with the protocol; it is unrelated to the CMI
STOP command.
• You can use CMI to change almost any line parameter you set in
SYSGEN, to change the path to a line or download it with a
different protocol module. Thus, you can change parameters
and paths on a temporary basis--for example, to accommodate
sporadic changes in line traffic--or to try out changes you'll
later commit to permanence with SYSGEN. If you're not quite
sure what values to use or how to balance the workload, you
can use CMI to experiment without having to cold-load every
time. A change you make with CMI lasts until the next cold-
load or until you issue a command to change the same entity.
To change line parameters with CMI, you must specify the
AUTOCONF parameter in the SYSGEN configuration file. If
AUTOCONF is set, a configuration change lasts until the next
cold-load or until you give a command to make another change.
(AUTOCONF set is the defaulted condition for ADCCP and BSC.)
If AUTOCONF isn't set, the application program sets parameters
after every download and modifies them as necessary. The
books that explain the protocols describe how an application
sets the configuration. There is more discussion of AUTOCONF
later in this section.
October 1985
3-8