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vNEX
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Expert

That's absolutely correct because slot size for memory is dictated by the highest reservation for powered on VM (+ mem overhead).

In your case it is 1000MB (because of Ubuntu01 reservation + 32MB overhead) = 1032MB slot size

Next you have to check vmkernel overhead you can verify it via ESXTOP below or through perf charts metrics ("Used by VMkernel " and "Overhead")

Image 18.png

In your case there is no more resources left for the next slot which is 1032MB no matter if the VM you are trying to power on has only 512MB RAM granted ...

If you want to avoid this hard limit you can override it by HA advanced attribute "das.slotmeminmb" with less value than your maximum VM reservation.

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Regards,

P.

_________________________________________________________________________________________ If you found this or any other answer helpful, please consider to award points. (use Correct or Helpful buttons) Regards, P.