Installation guide

As on ULTRIX systems, the following four daemons implement the
DIGITAL UNIX NFS service:
• portmap
The portmap daemon maps the remote procedure call (RPC) program
numbers of network services to their Transmission Control Protocol
(TCP) or User Datagram Protocol (UDP) port numbers. This daemon is
similar on DIGITAL UNIX and ULTRIX systems.
Like the ULTRIX portmap daemon, the DIGITAL UNIX portmap
daemon supports port checking. Port checking ensures that file access
requests were generated by an authorized client kernel, rather than by
an unauthorized application program.
• mountd
The mountd daemon checks the access permission of the client and
returns a pointer to the file system or directory that is to be mounted.
The mountd daemon is similar between DIGITAL UNIX and ULTRIX
systems. The difference is that, by default, on a DIGITAL UNIX
system, the daemon services requests only from the superuser of a
remote system. The ULTRIX mountd daemon services requests from
any user on the remote system.
Section 5.8 describes how to configure the mountd daemon so that it
runs like the ULTRIX daemon.
• nfsd
The nfsd daemon allows access to the NFS mounted file system. This
daemon is the same on DIGITAL UNIX and ULTRIX systems.
• nfsiod
The nfsiod daemon allows clients to read ahead and write behind to
NFS mounted file systems. This daemon is the same as the ULTRIX
biod daemon.
4.8.8 Differences in Partitioning Disks
Like ULTRIX disks, DIGITAL UNIX disks are divided into partitions. Disk
partitions are logical divisions of a disk that allow you to put files of the
same type into separate areas of varying sizes. Partitions have default
sizes that depend on the type of disk; the installation process uses these
default sizes unless it finds an ULTRIX partition table on the disk. To
specify alternative partition sizes as part of the installation, you must boot
the system into standalone mode and use the disklabel command to
create a partition table before running the normal installation procedure.
After the system is installed, you can change partition sizes with the
DIGITAL UNIX disklabel command.
Overview of DIGITAL UNIX System and Network Administration 4–15