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Operating system components of Oracle Parallel Server

Oracle Parallel Server
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CM The Cluster Manager watches over all the activity for all of the processors. All transactions register and de-register with this component. If a failure occurs in one instance, the Cluster Manager redirects traffic until it is fixed.
Startup The Startup component is part of the Windows NT operating system, but is not needed on other operating systems. It controls the sequence of events when the OPS starts up.
IO The Input/Output component coordinates simultaneous access to shared disks. It works with the Oracle process called the Integrated Distributed Lock Manager (IDLM).
IPC The interprocessor communication (IPC) component is responsible for moving information between the interconnected parallel processors as quickly as possible. A fast IPC is needed for good response time in the OPS.