ENVS 1800 Lecture Notes - Lecture 16: Network Operating System, Netware, Distributed Computing

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ENVS 1800 Tutorial 16 Notes Other operating system issues
Introduction
Some network operating systems also provide access to services on remote machines
that might not be available locally.
These services are called remote procedure calls (RPCs).
RPCs can be used to implement distributed computing.
Security and network management services provide security across the network and
allow users to manage and control the network from computers on the network.
These services also include protection against data loss that can occur when multiple
computers access data simultaneously.
Remote processing services allow a user or application to log in to another system on
the network and use its facilities for processing.
Thus, the processing workload can be distributed among computers on the network,
and users have access to remote computers from their own system.
The most familiar services of this type are probably telnet, and SSH.
When considered together, the network services provided by a powerful network
operatig syste trasfor a user’s oputer ito a distriuted syste.
Tanenbaum [TAN95] defines a distributed system
A distributed system is a collection of independent computers that appear to the users
of the system as a single computer.
Network operating systems are characterized by the distribution of control that they
provide.
Client-server systems centralize control in the server computer.
Client computers have their network access limited to services provided by the
server(s).
Novell NetWare is an example of a client-server system.
The operating system software on the server can communicate with every computer on
the network, but client software communicates only with the server.
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