HP Distributed Print Service Administration Guide

276 Chapter9
Managing Spoolers, Queues, and Logical Printers
Performing Other Spooler-Related Tasks
their jobs, try setting the upper boundary at 20 minutes. If they are
willing to wait 30 minutes, you could set the upper boundary at 45
minutes.
About the Queue Lower Backlog Boundary
You set the lower backlog boundary in relation to the upper boundary.
The lower boundary affects the number of notification messages you
receive for backlogged queues. If the lower boundary is too close to the
upper boundary, the addition or subtraction of just a few jobs in the
queue can cause the queue to change either into or out of the backlogged
state. The state might change so often that you are unable to identify
when a significant change in the number of jobs occurs.
If the lower boundary is too far from the upper boundary, it might take
too long for the queue to change out of the backlogged state. The queue
backlog could decrease and then increase significantly without a change
in the state. If the state does not change, you are not notified when
significant changes occur.
About the Queue Backlog Update Interval
The backlog update interval is the amount of time that HPDPS waits
until it calculates the time required to print all jobs in the queue. As a
starting point, you might want to set the backlog update interval to a
value that is ten percent of the upper backlog boundary. For example, if
the upper boundary is 60 minutes, start with an backlog interval of six
minutes.
The following describes the general effects of either increasing or
decreasing the backlog interval.
• If the interval is larger
A larger interval generally results in smaller increases and decreases
in the value of the queue-backlog attribute because there is more
time for jobs to be added and subtracted from the queue. Also, the
addition or subtraction of a single large job has less of an effect with a
larger interval because the calculated value is averaged out by the
greater possible number of smaller jobs added to or subtracted from
the queue.
If the interval is larger, the queue backlog might exceed the upper
boundary and then fall below it before HPDPS calculates the related
values. Or, the queue backlog might go below the lower boundary and