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 |
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
T.R | Title | User | Personal Name | Date | Lines |
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3865.1 | TOOK::ALEX | Alex Allister | Wed Oct 07 1992 12:58 | 43 | |
> 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 | |||||
3865.2 | more questions | CGOOA::KUHNEN | Thu Oct 08 1992 18:24 | 28 | |
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 | |||||
3865.3 | VERNA::V_GILBERT | Tue Oct 13 1992 10:32 | 7 | ||
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 | |||||
3865.4 | snmp entity | CGOOA::KUHNEN | Thu Oct 22 1992 18:33 | 12 | |
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 |