Open System Services NFS Management and Operations Guide

Port Mapper Protocol
Clients use the port mapper protocol to find port numbers associated with RPC programs. It also
provides a broadcast RPC facility. This fault-tolerant port mapper process implements the protocol
specified in the X/Open NFS document. It supports both TCP and UDP clients.
PCNFSD Protocol
The PCNFS Daemon (PCNFSD) protocol provides authentication and print services to OSS NFS
clients. OSS NFS implements PCNFSD protocol version 1 as specified by X/Open and the PCNFSD
protocol version 2 as specified by Sun. The protocol is supported for both TCP and UDP clients.
Nonconformant Items
Differences between the OSS NFS implementation and the X/Open XNFS specification are:
• OSS NFS handles security attributes differently from the XNFS specification. See Chapter 5
(page 57).
• The EXPORT object does not support the Mode, AnonMapping, or Root attributes required
by XNFS (section 2.4.1, page 14).
• Although [NGROUPS_MAX] for Open System Services is 32, OSS NFS behaves as though
[NGROUPS_MAX] is 0 and ignores all supplementary groups supplied with NFS requests.
External Interfaces
OSS NFS uses the communications and management external interfaces as described in these
topics.
Communications Interface
The communications interface accepts remote procedure call requests through NonStop TCP/IP.
The port mapper, mount, NFS, and PCNFSD protocols are supported.
The RPCINFO utility provided with RPC can be used to access the communications interface to
display port mapper information and to check NFS and PCNFSD availability on local or remote
hosts.
Management Interface
HP’s Distributed Systems Management (DSM) interface allows you to configure, control, and monitor
subsystems using the interactive interface of the SCF. For detailed information about the SCF
interface, see the appropriate SCF reference manual and the Open System Services NFS SCF
Reference Manual.
Processes and Files
Figure 1 (page 16) shows OSS NFS components and their interactions.
Manager Process
The manager process is the control center for the OSS NFS subsystem. It accepts, processes, and
traces Subsystem Programmatic Interface (SPI) commands; generates Event Management Service
(EMS) events; and starts and stops the other subsystem components. It is responsible for managing
the OSS NFS configuration files and the states of fileset mounting that result from client requests.
The manager process normally runs as a process pair.
Port Mapper
The port mapper maps RPC services to port numbers using the Sun Remote Procedure Call (RPC)
protocol. Communication between the port mapper and RPC-based services uses NonStop TCP/IP
instead of a direct operating system interprocess message.
Nonconformant Items 15