Technical data

printer that always prints text documents one-up in portrait mode, and
another that prints such documents two-up in landscape mode with line
numbers. By associating each of these logical printers with one queue, the
system directs the documents submitted to the one or more physical printers
associated with that queue.
Fan-in and fan-out queues can be used together to provide a high degree of
flexibility and convenience.
2.1.4 Using Multiple Supervisors on a Single Host
If you intend to support more output devices from one server host than
is specified by the maximum-number-of-printers-supported server
attribute, use more than one supervisor process and object. You might wish
to support more than one supervisor, even before you reach the maximum
number, for the following reasons:
• Heavily loaded server processes constitute a single point of failure,
should the server host go down.
• Creating less than the maximum gives you more flexibility for
reconfiguring the system as needs change.
• Heavily loaded server processes can be less responsive, making them
more difficult to swap, and swapping affects more printers.
2.1.5 Using Supervisors on Direct-Connected Printers
Some output devices are connected through a serial port or parallel port
that is attached directly to a host system’s hardware. Advanced Printing
Software requires that you run a supervisor process on any host that
has such direct-connected printers. If, in your environment, several such
printers are connected to users’ workstations, each workstation will need to
run a supervisor process. Administrators of those workstations can choose
whether to associate the physical printers with queues on a central spooler
or on several distributed spoolers.
2.2 Planning Name Services
As the servers, queues, and printers become more numerous, assigning,
managing, and distributing unique object names becomes a more complex
task. In this environment, it might be benficial to use Network Information
System (NIS) software to distribute a centrally managed printer object
name map.
See Chapter 3, for more information about printer configuration files and
the Network Information System software.
Planning an Installation 2–3