PMP Mail Archive: PMP> RE: question about the printer mib

PMP Mail Archive: PMP> RE: question about the printer mib

PMP> RE: question about the printer mib

From: McDonald, Ira (imcdonald@sharplabs.com)
Date: Wed Feb 20 2002 - 16:03:07 EST

  • Next message: McDonald, Ira: "PMP> FW: Response to Printer MIB Comments of 15 Nov, 2001"

    Hi Juergen,

    I agree with you that 'prtMarkerLifeCount' SHOULD be persistent.
    And that's what RFC 1759 (Printer MIB v1) said in the same words
    used in the latest Printer MIB v2 draft, but in section 2.3, not
    in the object definition itself.

    Back in 1994, the chance that a low-end printer might have trouble
    supporting persistent counters was probably much higher.

    I would suggest that you may actually safely assume that the
    'prtMarkerLifeCount' _is_ persistent, because I've never heard
    of a modern printer where it is not persistent.

    Should we improve the DESCRIPTION clause of 'prtMarkerLifeCount'
    to explicitly add something like:

       "Note: This object SHOULD be implemented as a persistent
        object with a reliable value throughout the lifetime of
        the printer."

    Cheers,
    - Ira McDonald, co-editor of Printer MIB v2

    -----Original Message-----
    From: Juergen Schoenwaelder [mailto:schoenw@ibr.cs.tu-bs.de]
    Sent: Wednesday, February 20, 2002 5:03 AM
    To: imcdonald@sharplabs.com
    Cc: pmp@pwg.org; Ron.Bergman@Hitachi-hkis.com; bwijnen@lucent.com
    Subject: Re: question about the printer mib

    >>>>> McDonald, Ira writes:

    Ira> So there is no absolute guarantee that 'prtMarkerLifeCount' is
    Ira> always accurate for the life of the printer.

    So what is the practical value of this zero-based counter
    prtMarkerLifeCount if management applications can not rely on it?

    I would feel much better if the RFC says "if you implement
    prtMarkerLifeCount, then it has to be persistent" rather than
    allowing non-persistent prtMarkerLifeCount implementations that
    basically report some random numbers (wrt. to the semantics of
    prtMarkerLifeCount) and potentially confuse applications.

    /js

    -- 
    Juergen Schoenwaelder      University of Osnabrueck
    <schoenw@inf.uos.de>       Dept. of Mathematics and Computer Science
    Phone: +49 541 969 2483    Albrechtstr. 28, 49069 Osnabrueck, Germany
    Fax:   +49 541 969 2770    <http://www.informatik.uni-osnabrueck.de/>
    



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