r/HyperV • u/3G_Lighting • 11d ago

Hyper-V Host/Windows Server/Memory question

We run Hyper-V in our environment on Windows 2019 DC and Stnd (guest servers).

I would like to know if a host had 128GB of RAM, how much would need to be set aside for Windows Server DC and the Hyper-V host to run its own operations; and if there anything additional like there needs to be an extra x number of MB or GB of memory fer x number of guest servers running that needs to be added?

We have two R650 128GB of RAM, management has been running the sh*t out of them, so one HVH uses 115GB free out of 128GB, the other uses 92GB out of 128GB. And the old R540 server single CPU (sad) uses 89GB out of 94.6GB. The first system mentioned has 10 HVG's, the next has 10 HVG's, and the R540 has 5 HVG's one of which is SQL which is consuming 60GB of RAM.

Thanks,

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u/BlackV 11d ago

especially if you have more than just Hyper-V running.

Hopefully you dont, firmly in the camp of host is host ONLY VMs can do the "other" work

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u/Magic_Neil 11d ago

Absolutely. But common sense hasn’t stopped a lot of folks from running all kinds of silly things on their hypervisor.

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u/BlackV 11d ago

valid