A vSphere administrator determines that more metrics are available for viewing in the realtime
view than are available in the daily view for a virtual machine.
What is the reason for this discrepancy in the number of available metrics?
A.
The daily view does not contain all of the metrics that the realtime view does.
B.
The default vCenter statistics level is being used.
C.
A vCenter statistics level of 4 is being used.
D.
The daily view presents a different selection of metrics by default than presented by the
realtime view.
Explanation:
The statistics level for the different rollup levels:
By default the Statistics Level in vCenter Server is set to Level 1 for each level.
This controls the amount of data that is gathered for the level:
Level 1 – Includes the basic metrics Average Usage for CPU, Memory, Disk and Network, System Uptime, System Heartbeat, and vCenter DRS Metrics. Statistics for devices are not included at this level.
Level 2 – This level includes all metrics for CPU, Memory, Disk and Network counters (average, summation and latest rollup types – maximum and minimum rollup types are excluded), System Uptime, System Heartbeat and vSphere DRS metrics. Statistics for devices are not included at this level.
Level 3 – This level includes all metrics (including devices) for all counter groups (average, summation and latest rollup types – maximum and minimum rollup types are excluded).
Level 4 – This level includes all metrics supported by vCenter Server.
Note: VMware does not recommend setting the Statistics Level higher than Level 2 unless debugging an issue. The amount of data collected is substantially greater and without adequate processing power on the SQL server could cause performance data to be not collected properly.
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Whether an Interval Duration is Enabled or Disabled.
How long the interval between samples is for the statistic level
This is only available for the first statistic level (5 minute(s) interval in the diagram above)
How long the information is kept for in the statistic Level
By default we only keep the statistical data for 1 year, and after that it is purged.
It is possible to extend this, and also to keep the data for specific statistic levels for a longer length of time if this granular level of data is needed.
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I think it is a matter of exclusion.
A (is FALSE, default they will show the SAME metrics)
B (is FALSE, than there would be NO difference)
D (is FALSE, default they will show the SAME metrics)
C (is TRUE, the only logical explanation)
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in real time in default are metric:
– CPU, datastore, disk, memory, network, power, system, virtual disk
then in real time exist power who not exist in default in vCenter less data is inserted to database
i thing B is OK
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JanK, I think you are right.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2003885
Generally, only statistics levels 1 and 2 are used for performance monitoring and analysis. Basic performance data are gathered at these levels. If you want to see more detailed information, you can view the statistics in (!)REAL-TIME(!), which enables you to see EVERY available METRIC (!)WITHOUT(!) MODIFYING the collection level.
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Additional Information : http://www.vmware.com/pdf/vi3_monitoring_statistics_note.pdf
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