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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<div class="SECT1">
<h1 class="SECT1"><a name="LOADBALANCE">12.14. Printer Load
Balancing</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">ss=</tt><i class="EMPHASIS">queue
served by printer</i></p>
</li>
<li>
<p><tt class="LITERAL">sv=</tt><i class=
"EMPHASIS">printers where jobs are sent (servers)</i></p>
</li>
</ul>
<br>
<br>
<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><i
class="EMPHASIS">mainqueue</i> printcap entry This informs
the <b class="APPLICATION">lpd</b> server that the queue
operates under the control of the <i class=
"EMPHASIS">mainqueue</i> 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 <i
class="EMPHASIS">mainqueue</i>, it will check to see if there
is an idle <i class="EMPHASIS">service</i> 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 <i
class="EMPHASIS">hide</i> 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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