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Erroneous Estimated Loads

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Erroneous Estimated Loads

This question was originally posted on DCIM Support by Nigel Fanning on 2017-04-19


We have a situation where the Estimated Loads in different datacentres are simultaneously changing.  Sometimes this difference is large - see below:

Ignore the measured load for this instance as the pdu's are not enabled.

In the above DC, all the devices that add up to the new low figure are from work order provisioned devices - therefore the two 230 watt devices in the rack below add up to 0.46kW.  So this might be a clue to why the figures are low.  However in other datacentres the aggregated load does not seem to be related to work ticket activity.

Can these differences be explained as they are throwing our estimated load figures out?

 

 

 

(CID:116922358)


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DCIM_Support
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Re: Erroneous Estimated Loads

This answer was originally posted on DCIM Support by Anders Thorbjørn Jensen on 2017-04-19


Hi Nigel Fanning

I'm a bit curious about your settings for Power Capacity Preferences. And I have a question for you.

What are your settings for "Estimated Load Strategy"?

There are two settings - one is "Adjusted Nameplate" and the other is "Predicted power" (See attached screenshot)

My assumption is that you have selected Predicted Power. For a thorough understanding of predicted power take a look at this page:

About predicted power

The second note explains how estimated load is calculated until you execute the pending change. And with Measured Peak equal to zero the behaviour you explain above is to be expected. 

But please confirm your settings for "Estimated load strategy" before we explore possible solutions further.

/Anders

 

 

(CID:116923525)

See Answer In Context

3 Replies 3
DCIM_Support
Picard
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237

Re: Erroneous Estimated Loads

This answer was originally posted on DCIM Support by Anders Thorbjørn Jensen on 2017-04-19


Hi Nigel Fanning

I'm a bit curious about your settings for Power Capacity Preferences. And I have a question for you.

What are your settings for "Estimated Load Strategy"?

There are two settings - one is "Adjusted Nameplate" and the other is "Predicted power" (See attached screenshot)

My assumption is that you have selected Predicted Power. For a thorough understanding of predicted power take a look at this page:

About predicted power

The second note explains how estimated load is calculated until you execute the pending change. And with Measured Peak equal to zero the behaviour you explain above is to be expected. 

But please confirm your settings for "Estimated load strategy" before we explore possible solutions further.

/Anders

 

 

(CID:116923525)

DCIM_Support
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Picard
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236

Re: Erroneous Estimated Loads

This comment was originally posted on DCIM Support by Nigel Fanning on 2017-04-21


Thanks Anders.  This has answered the question.  We made a change on the 28th March to Predicted Power - the administrator thought it was a local not global change.  The change back to Adjusted Power more accurately reflects the racked equipment.

Perhaps it should be made clear which parameters are for local users and which will affect the parameters seen by all users?

This situation has also made us think about how global parameter settings affect data halls with different diagnostic tools, i.e. some data halls have intelligent power strips monitoring power and some do not.

(CID:116923746)

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🔒 Closed

This question is closed for comments. You're welcome to start a new topic if you have further comments on this issue.