Pathway/XM System Management Manual

Managing a Pathway/XM Environment
Compaq NonStop™ Pathway/XM System Management Manual—426761-001
7-13
Cold Starting a Pathway/XM Environment
To restart a Pathway/XM environment with a previously started configuration,
saving many changes made during previous PXMCOM operation but using new
PATHMON configuration (PATHCTL) files, you specify the COOL start option. If
an error condition occurs after a warm start, you can often correct the error by doing
a cool start. The COOL start option uses the current configuration information in
the SuperCTL file, but directs each PATHMON process to create a new PATHCTL
file.
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Warm starting a Pathway/XM environment
To restart a Pathway/XM environment with a previously started configuration,
saving as many changes as possible from previous PXMCOM operation, you
specify the WARM start option. The WARM start option uses the current
configuration information in the SuperCTL file and directs the PATHMON
processes to get the configuration information from their existing PATHCTL files.
A warm start is usually faster than a cold start or a cool start.
The types of configuration changes preserved during each of the three start options are
summarized in Table 7-1, Effect of Online Configuration Changes
. For the syntax of
the START PATHWAY command, refer to START PATHWAY on page 11-55.
Cold Starting a Pathway/XM Environment
To cold start a Pathway/XM environment, enter the START PATHWAY command with
the COLD start option, as follows:
>> START PATHWAY COLD
In response to this command, PXMCOM performs the following steps, using the initial
configuration information in the SuperCTL file:
1. Creates the process broker (PB) processes: one PB process pair for each NODE
object specified in the configuration.
2. Creates the PATHMON processes: one for each NODE object specified in the
NODES attribute of the SET PATHMON command.
3. Causes a PATHWAY object to be configured in each PATHMON process.
4. Issues a PATHCOM START PATHWAY command to each PATHMON process.
These commands cause the PATHMON processes to create their PATHMON
configuration (PATHCTL) files and their backup processes. Each PATHMON
process preallocates disk space for its PATHCTL file based on the maximum values
that you specified in the SET PATHWAY statements.
5. Records the names of the newly created PATHCTL files in the SuperCTL file.
6. Causes the TCP processes, PROGRAM objects, and server classes to be configured
in their PATHMON processes. However, no processes are created yet for these
entities.