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What flaws or shortcomings are there with this quota system?
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The ones named above (wrongly logged job in case of
printer hardware failure, and so on).
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In reality, CUPS counts the job pages that are being
processed in
software
(that is, going through the
RIP) rather than the physical sheets successfully leaving the
printing device. Thus, if there is a jam while printing the fifth sheet out
of 1,000 and the job is aborted by the printer, the page count will
still show the figure of 1,000 for that job.
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All quotas are the same for all users (no flexibility
to give the boss a higher quota than the clerk) and no support for
groups.
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No means to read out the current balance or the
“used-up” number of current quota.
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A user having used up 99 sheets of a 100 quota will
still be able to send and print a 1,000 sheet job.
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A user being denied a job because of a filled-up quota
does not get a meaningful error message from CUPS other than
“client-error-not-possible”.
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