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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<h1 class="SECT1"><a name="LOADBALANCE" id="LOADBALANCE">12.14.
Printer Load Balancing</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">ss=</tt><span class=
"emphasis"><i class="EMPHASIS">queue served by
printer</i></span></p>
</li>
<li>
<p><tt class="LITERAL">sv=</tt><span class=
"emphasis"><i class="EMPHASIS">printers where jobs are sent
(servers)</i></span></p>
</li>
</ul>
<p>In a large site, you could have several equivalent printers,
which will be used by many people. The reason for this is, of
course, to increase the printer output by enabling several jobs
to be printed at once. A load balance print queue is one that
feeds jobs to other queues and has a <tt class=
"LITERAL">sv=q1,q2,...</tt> printcap entry that specifies the
destination or server queues. These must be print queue entries
and have spool directories on the server.</p>
<p>The service queues have a <tt class=
"LITERAL">ss=</tt><span class="emphasis"><i class=
"EMPHASIS">mainqueue</i></span> printcap entry This informs the
<b class="APPLICATION">lpd</b> server that the queue operates
under the control of the <span class="emphasis"><i class=
"EMPHASIS">mainqueue</i></span> print queue, and is fed jobs
from it.</p>
<p>During normal operation, when the <b class=
"APPLICATION">lpd</b> server has a job to print in the
<span class="emphasis"><i class=
"EMPHASIS">mainqueue</i></span>, it will check to see if there
is an idle <span class="emphasis"><i class=
"EMPHASIS">service</i></span> queue. If there is, it will
transfer the job to the service queue spooling directory and
start the service queue printing activities.</p>
<p>Even though the queues are not meant for direct use, people
can print directly to individual queues. This allows a specific
load sharing printer to be used. If you wanted to <span class=
"emphasis"><i class="EMPHASIS">hide</i></span> the load sharing
printers, i.e. - not allow direct spooling to them, then you
would simply remove the non-server entries from the
printcap.</p>
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