NonStop Operations Guide for H-Series and J-Series RVUs

6 Processes: Monitoring and Recovery
• “When to Use This Chapter” (page 79)
• “Types of Processes” (page 79)
“System Processes” (page 79)◦
◦ “CIP Processes” (page 80)
◦ “I/O Processes (IOPs)” (page 79)
◦ “Generic Processes” (page 80)
• “Monitoring Processes” (page 80)
“Monitoring System Processes” (page 81)◦
◦ “Monitoring IOPs” (page 82)
◦ “Monitoring CIP Processes” (page 82)
◦ “Monitoring Generic Processes” (page 82)
• “Recovery Operations for Processes” (page 84)
• “Related Reading for Processes” (page 84)
When to Use This Chapter
This chapter provides basic information about the different types of processes for NonStop systems.
It gives a brief example of monitoring each type of process and provides information about the
commands available for recovery operations.
Types of Processes
Three types of processes are of major concern to a system operator of NonStop NS-series systems
and NonStop BladeSystems:
• “System Processes” (page 79)
• “I/O Processes (IOPs)” (page 79)
• “CIP Processes” (page 80)
• “Generic Processes” (page 80)
System Processes
A system process is a privileged process that is created during system load and exists continuously
for a given configuration for as long as the processor remains operable. Examples of system
processes include the memory manager, the monitor, and the I/O control processes.
I/O Processes (IOPs)
An I/O process (IOP) is a system process that manages communications between a processor and
I/O devices. IOPs are often configured as fault-tolerant process pairs, and they typically control
one or more I/O devices or communications lines. Each IOP is configured in a maximum of two
processors, typically a primary processor and a backup processor.
An IOP provides an application program interface (API) that allows access to an I/O interface. A
wide area network (WAN) communications line is an example of an I/O interface. IOPs configured
using the SCF interface to the WAN subsystem manage the input and output functions for the
When to Use This Chapter 79