connecting more than 2 power supplies to rack PDU

[DCIM_Support]

When connecting a device with more than 2 power-supplies (A-Feed, B-Feed), calculation of estimated load will be calculated wrong.
e.g.

• Cisco Nexus 7018  with 6 power supplies
• Adjusted Nameplate: 4,500W
• PDU connections: A-Feed  (3 power supplies L1, L2, L3)
                                   B-Feed  (3 power supplies L1, L2, L3)
• calculated estimated load on rack:  14KW 

(CID:105459114)

[DCIM_Support]

Hi Hermann

Yes the estimated load calculations are very pessimistic in versions 7.5 and previous The reason is that some equipment with many power supplies might turn off some of the power supply to raise efficiency of the ones that are running. Since we don't know if this is happening we are erroring on the safe side (by applying the load to all phases).

In version 8.0 we are looking at this and are working on handling this situation less pessimistic and communicate the result more clearly.

I can't remember right now if there is a good work-a-round for version 7.5 and previous.

Best,

Niels

(CID:105459118)

[DCIM_Support]

medamhe1 Niels Kjeldsen - I have the same problem with the same device (and others) but couldn't find a work around.  I believe there should be a feture request in for it.

(CID:105459655)

[DCIM_Support]

For what its worth, we have been adjusting the "Adjusted Nameplate" values to be 1/3 of the values to get around this problem.  If it is ever fixed we can get the original name plate values from the genomes library and restore them in a few minutes in equipment browser.

(CID:105459212)

[DCIM_Support]

For now this seems to be the best workaround.

(CID:105459926)

[DCIM_Support]

medamhe1 and @james.halpin - thank you for reminding us of the current limitation within Data Center Operation 7.5. I want to assure you that this functionality is going to be tremendously improved in version 8.0 as Niels Kjeldsen already has hinted at in his answer.

(CID:105459925)

[DCIM_Support]

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