NonStop NS-Series Operations Guide (H06.12+)

This process:
• Runs on the system console
• Is preconfigured on your system during system generation
TACL processes are started on $YMIOP.#CLCI by commands in the CIIN file. If a read operation
is pending, such as a TACL prompt on $YMIOP.#CLCI, write operations are blocked, causing
the process attempting the write operation to wait indefinitely.
$YMIOP.#CNSL
$YMIOP.#CNSL is a write-only device for logging.
This process:
• Runs on the system console
• Is preconfigured on your system during system generation
$ZHOME
The $ZHOME process is a process pair that provides a reliable home terminal to which processes
can perform write operations. The $ZHOME process can be used by processes that must write
to the system console but do not require a response.
$ZHOME is preconfigured on your system by the CONFBASE file. $ZHOME is a generic process
that is part of the SCF Kernel subsystem. Note the following about the configuration of $ZHOME:
• The $ZHOME process is configured with $YMIOP.#CLCI as its HOMETERM, INFILE, and
OUTFILE.
• Because $ZHOME acts as a reliable home terminal designed to interact with the system
console, $YMIOP.#CLCI, HP recommends that you do not change its configuration. Most
important:
— Do not specify $ZHOME for the INFILE, OUTFILE, or HOMETERM for the $ZHOME
process.
— Never specify $ZHOME for the INFILE for a process. The $ZHOME process returns
the FEINVALOP error (file-system error 2) in response to any read operation.
• Generic processes started by the $ZPM persistence manager inherit $YMIOP.#CLCI as the
HOMETERM, INFILE, and OUTFILE unless these attributes are changed in the configuration
record for the generic process. HP recommends that you configure most NonStop Kernel
and system-level generic processes to use $ZHOME for the HOMETERM and OUTFILE.
$ZHOME Alternative
Instead of $ZHOME, you might want to use the optional NonStop Virtual Hometerm Subsystem
(VHS) product if both of the following conditions are true:
• The processes you are configuring cannot handle error responses returned if $YMIOP.#CNSL
or $YMIOP.#CLCI is not available.
• The process must perform read operations to the device.
Example Command Files
This section describes and shows examples of command files that can be used to start up and
shut down the server:
• Examples and sample programs are for illustration only and might not be suited for your
particular purpose.
HP does not warrant, guarantee, or make any representations regarding the use or the results
of the use of any examples or sample programs in any documentation. You must verify the
Example Command Files 175