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.
Correct Answer: B
Explanation/Reference:
Explanation:
There are four statistics levels. Each level determines the type and amount of data that is collected.
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.
By default the Statistics Level in vCenter Server is set to Level 1 for each level. Sometimes this is increased to higher levels within an environment for various reasons, more than likely troubleshooting.
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.
Incorrect Answers:
A: The metrics displayed in the daily view are defined by the current statistics level. The default is 1 so there are less metrics displayed in the daily view.
The real-time view metrics are not defined by the current statistics level.
C: If a statistics level of 4 is being used, all the metrics available in the real-time view would be available in the daily view.
D: The metrics displayed in the daily view are available in the real-time view.
References:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2003885
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2007388