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Conference azur::mcc

Title:DECmcc user notes file. Does not replace IPMT.
Notice:Use IPMT for problems. Newsletter location in note 6187
Moderator:TAEC::BEROUD
Created:Mon Aug 21 1989
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6497
Total number of notes:27359

3865.0. "historian questions" by CGOOA::KUHNEN () Tue Oct 06 1992 20:14

    Hello,
    
    
    I would like to clarify a few points about recording data and then 
    getting statistical information from the recorded information.
    
    When I record a partition such as counters I also have to record all
    attribute partions for the same entity. Do I have to record them with
    the same frequency or can I record identifier or characteristic 
    partitions with a lesser freqency such as the default frequency.
    
    When I attempt to get statistics on historical data do I set the scope
    of interest time duration and repeat interval the same interval as
    which I recorded the data ?
    
    In some cases the period between successful polls is sightly greater
    than the polling interval specified for the recorded data. Will this
    effect the output from a statistics screen ?
    
    If I am specifying a scope of interest time , how close to the actual
    start time for a recorded interval do I have to be ? For example if
    I started recording at 14:39:39 does my scope of interest time have to
    start at exactly this time or will the historian look for the nearest
    data recorded and then start from there?
    
    Will graphing work in the same way ?
    
    Thanks
    
    Harry
    
    
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3865.1TOOK::ALEXAlex AllisterWed Oct 07 1992 12:5843
>    When I record a partition such as counters I also have to record all
>    attribute partions for the same entity. Do I have to record them with
>    the same frequency or can I record identifier or characteristic 
>    partitions with a lesser freqency such as the default frequency.
    
    I assume that you want/need to record all other partitions when recording
    counters (Historian does not require you to). Recording of partitions
    for the same entity are independent and polling periods do not have to
    match.
    
>    When I attempt to get statistics on historical data do I set the scope
>    of interest time duration and repeat interval the same interval as
>    which I recorded the data ?
    
    Yes you can do that. Also you can select larger intervals for computing
    statustics than the polling intervals selected for recording. It does not
    make sense to select smaller intervals for statistics -- you will not
    get meaningful results, since the data was not recorded that often.
    
>    In some cases the period between successful polls is sightly greater
>    than the polling interval specified for the recorded data. Will this
>    effect the output from a statistics screen ?
    
    Small variations are to be expected and the overall results will still
    be meaningful.
    
>    If I am specifying a scope of interest time , how close to the actual
>    start time for a recorded interval do I have to be ? For example if
>    I started recording at 14:39:39 does my scope of interest time have to
>    start at exactly this time or will the historian look for the nearest
>    data recorded and then start from there?
    
    The Information Manager retrieves data with the closest available
    timestamps (as a rule one before and one after the time specified.
    You should be able to round scope of interest time based on the
    polling period (e.g., if you poll every hour and if you need stat-s
    for several hours, round to the nearest hour).
    
>    Will graphing work in the same way ?
    
    Same Info. Mgr retrieval applies.
    
    Alex
3865.2more questionsCGOOA::KUHNENThu Oct 08 1992 18:2428
    I understood from the manuals that if you wanted to do statistics on
    recorded data that various other partitions other can counters also had
    to be recorded. I would have expected this to be the case because 
    utilization requires the line speed attribute to be calculated. I
    wanted to know would the pa fm look for the last recorded value of line
    speed or does the information have to be recorded at the same time as
    the counters partition.
    
    I also am having problems using the graphing function. When I try to
    graph counters I will many times get a 0 on the graph which would
    indicate that the data has not been recorded. However when I display
    the recorded data using the show counters command the data is always
    available.
    
    
    
    I also find that I am unable to graph or display statistics from
    recorded data. When I do a show statistics command I find that
    I get a management window message: software error: output data buffer
    too small. I expect the same sort of error is causing the graphing of
    statistical information to fail too.
    
    
    I cannot find this error documented in the messages manual.
    
    Thanks
    
    Harry Kuhnen
3865.3VERNA::V_GILBERTTue Oct 13 1992 10:327
Harry,

Exactly what operations are you doing (show statistics on what entity class)
that cause the management window message: software error: output buffer too 
small.

Verna
3865.4snmp entityCGOOA::KUHNENThu Oct 22 1992 18:3312
    Verna,
    
    
    I am showing statistics on an snmp entity on the interface instance,
    for example show snmp wellfleet interface 1 all statistics. I have
    set up the scope of interest time to cover a period in the past.
    When I examine the counters with the same scope of interest period
    the data is all available. Graphing of the data also fails.
    
    Thanks
    
    Harry