Open System Services NFS Management and Operations Guide

Figure 1 OSS NFS Components
LAN Interface Process
The local area network (LAN) interface process accepts incoming requests from NonStop TCP/IP
and forwards them to the appropriate servers. It also preprocesses mount protocol requests before
passing them to the manager process, traces requests and responses, and responds to SPI requests
sent through the manager process. It runs as a single process (not a process pair), but it is
automatically restarted by the manager process if it fails due to a hardware trap or processor
failure.
Server Processes
Each OSS NFS server implements the NFS protocol for a single OSS fileset. An OSS NFS server
runs as a cluster of processes and is automatically restarted by the manager process if it fails
because of a hardware trap or processor failure. The master server process is called the headpin,
and it manages a pool of five slave processes that provide request multithreading.
PCNFSD Processes
The PCNFSD processes implement user authentication and printing services associated with the
PCNFSD protocol. PCNFSD is an extension to NFS that allows systems not based on the UNIX
operating system to interact in a secure manner with NFS servers. The PCNFSD processes also
implement print spooling services.
16 Introduction to OSS NFS