HP NonStop NS manual Avoid Manual Intervention, Use Parallel Processing

Creating Startup and Shutdown Files Avoid Manual Intervention

Avoid Manual Intervention

Write startup and shutdown files so that they execute correctly without requiring manual intervention. Any time an operator must intervene, startup and shutdown time increase and the possibility of human error increases.

Use Parallel Processing

Parallel processing decreases the time required to start up or shut down your system or application because startup and shutdown processes are distributed throughout the processors in your system. For example, this SCF command file uses parallel processing in four processors to start several communications lines. The files START0, START1, START2, and START3 contain the actual commands that start the communications lines.

This command file uses a special technique intended to ensure that each process gets started even if a given processor is out of service. The technique is to start each process in two processors. If the first processor is down, the command file continues to the next processor. If the first processor is up, and the process is started, the command file still continues to the next processor but fails because the process name ($Sn) is in use by the process that was successfully started. As a result, a specified process is started in whichever processor is running. Of course, if neither processor is up, the attempt to start the process fails.

SCF /IN START0, NOWAIT, CPU 0, NAME $S0/

SCF /IN START0, NOWAIT, CPU 2, NAME $S0/

SCF /IN START1, NOWAIT, CPU 1, NAME $S1/

SCF /IN START1, NOWAIT, CPU 3, NAME $S1/

SCF /IN START2, NOWAIT, CPU 2, NAME $S2/

SCF /IN START2, NOWAIT, CPU 0, NAME $S2/

SCF /IN START3, NOWAIT, CPU 3, NAME $S3/

SCF /IN START3, NOWAIT, CPU 1, NAME $S3/

When using the technique shown in this command file, make sure to spread the process workload across all available processors. If there are too many processes to start in processors 0 and 1, queuing and memory-contention problems can result.

HP Integrity NonStop NS-Series Operations Guide—529869-005

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