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(x)ntpd questions - SCO

My company has a variety of systems running Openserver 5.0.5 and 5.0.6. We are interested in running xntpd (5.0.5) or ntpd (5.0.6) on some of the systems but I've been unable to find some definitve answers to some questions. If anyone can lend a hand and answer a few, great. 1. Does Openserver 5.0.5/5.0.6 ever slew the clock instead of reset (step) it? The only messages I ever get are resets. 2. If it does slew it, what is the threshold between slewing and stepping? I've read 128ms for other OSs, but haven't found anything on for SCO's OSs. Is ...

  1. #1

    Default (x)ntpd questions

    My company has a variety of systems running Openserver 5.0.5 and
    5.0.6. We are interested in running xntpd (5.0.5) or ntpd (5.0.6) on
    some of the systems but I've been unable to find some definitve
    answers to some questions. If anyone can lend a hand and answer a
    few, great.

    1. Does Openserver 5.0.5/5.0.6 ever slew the clock instead of reset
    (step) it? The only messages I ever get are resets.

    2. If it does slew it, what is the threshold between slewing and
    stepping? I've read 128ms for other OSs, but haven't found anything
    on for SCO's OSs. Is this threshold tuneable?

    3. Since it looks like the systems are only ever stepping the clock in
    my case, it's possible that a given second could either be repeated or
    skipped. How will cron be effected by this? I've read some posts
    that say it is, others that say it isn't, and yet some say it could be
    effected. I realize that will large time changes, odd things can
    happen, but how about small changes (< 1 second). After the initial
    syncing, I would hope that the changes would all be small.

    TIA
    Chris
    Chris Guest

  2. #2

    Default Re: (x)ntpd questions

    In article <google.com> net (Chris Drudge) writes:
    $1. Does Openserver 5.0.5/5.0.6 ever slew the clock instead of reset
    $(step) it? The only messages I ever get are resets.

    I believe so, but I long ago got in the habit of replacing the
    stock time daemon with newer ones from ntp.org. Not due to problems
    on SCO's part, but rather because 5.0.5/6 are now somewhat old and
    ntpd has not stood still. (I'm not sure, though, why SCO shipped
    a 3+-yr-old beta of ntpd in 5.0.7 when a production release had
    been available for a year or so before 5.0.7 shipped ...)

    $2. If it does slew it, what is the threshold between slewing and
    $stepping? I've read 128ms for other OSs, but haven't found anything
    $on for SCO's OSs. Is this threshold tuneable?

    Not sure I've ever seen doentation on this, I'm afraid, and short
    of messing with the source code, I don't believe it's tuneable.

    $3. Since it looks like the systems are only ever stepping the clock in
    $my case, it's possible that a given second could either be repeated or
    $skipped.

    The -x flag "Prevents xntpd from ever stepping the clock backwards
    in time" (according to the 5.0.5 man page), so if you specify this,
    you needn't worry about a given second being repeated - though this means
    that if you end up with a significant time error (e.g. if you set the
    clock a few minutes ahead when you boot) it may take a long time for it
    to get back to the real time.

    I've seen some of the same warnings you've seen about cron.
    In practice, I have various ntpd versions running on 5.0.4/5/6/7
    systems and have never seen a problem.

    As you noted, once the clock gets in sync, it usually tends to
    stay close enough that ntpd updates it by slewing rather than
    stepping. Even my home PC, which is by far the worst at keeping
    in sync out of the SCO machines I run, usually stays within about
    50 ms.

    Hope that helps, at least a bit.
    --
    Stephen M. Dunn <ca> [/ref][/ref]
    ------------------------------------------------------------------
    Say hi to my cat -- http://www.stevedunn.ca/photos/toby/
    Stephen Guest

  3. #3

    Default Re: (x)ntpd questions

    In article <ca>,
    Stephen M. Dunn <ca> wrote: 
     

    I don't know if my memory is failing me - or if I'm confusing it
    with another OS but at one time didn't SCO only set to the nearest
    minute and discard the seconds. Some OS used to do that if not
    SCO.


    --
    Bill Vermillion - bv wjv . com
    Bill Guest

  4. #4

    Default Re: (x)ntpd questions

    In article <com> com writes:
    $I don't know if my memory is failing me - or if I'm confusing it
    $with another OS but at one time didn't SCO only set to the nearest
    $minute and discard the seconds. Some OS used to do that if not
    $SCO.

    Long ago, asktime used to have no way of setting seconds;
    could that be what you're remembering?
    --
    Stephen M. Dunn <ca> [/ref][/ref]
    ------------------------------------------------------------------
    Say hi to my cat -- http://www.stevedunn.ca/photos/toby/
    Stephen Guest

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