‎Server Power restoration in PSU failure | DELL Technologies

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Abhijeet6433

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Abhijeet6433

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August 14th, 2018 06:00

Server Power restoration in PSU failure

CMC decreases power to servers when an insufficient power event occurs.

Power for higher priority servers is restored incrementally while power needs remain within the power budget.

https://www.dell.com/support/manuals/in/en/inbsd1/dell-cmc-v5.0-m1000e/cmcm1000e5.0_ug-v1/psu-failure-with-degraded-or-no-redundancy-policy?guid=guid-ce289c8c-1bd9-4753-b582-87a099eefc66&lang=en-us

Can anyone explain how the power allocation happens?

For e.g. if Server Power has been reduced to 200 W during power failure event.After that, it requests 200 W more but only 150 W is available.

Is the server denied power, or it is allocated a reduced value (e.g. 350W)?

DM
Daniel My
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Posted August 14th, 2018 09:00
Hello

The CMC works together with the iDRAC on each blade to control power. When the CMC throttles power it doesn't just reduce the available power to each server, the iDRAC on each server reduces usage. The blades should not request more power than available because the iDRAC on the blade is reducing usage. When this occurs there will be a noticeable reduction in performance.

Thanks