[PVE-User] Max limits questions

[Anton Shevtsov]

Thomas, thanks for answers.

I've got one more question.

We plan to use approximately 80-100 nodes in pve cluster.

Will the cluster work be stable? Or is it unknown?


18.11.2022 16:16, Thomas Lamprecht пишет:
> Hi,
>
> Am 16/11/2022 um 07:30 schrieb Anton Shevtsov:
>> Where i can find information about below questions
>>
>> VM
>>
>> 1. Max vCPU count per VM ?
> Proxmox VE places no limit on that, so basically how many the PVE host CPU has.
> With more the KVM acceleration cannot work any more, so it gets rather slow and unpracticable.
>> Node host
>>
>> 1. How many maximum CPU cores are supported per node?
> Kernel dependent. For the current supported Proxmox VE 7.2's 5.15 kernel it's
> 8192 per CPU as you can find out by checking the kernel compile config:
>
> grep NR_CPUS /boot/config-5.15.*-pve
>
> Multi-Socket systems normally stop at 4 sockets, but we know a setup with 8 sockets
> that uses Proxmox VE. So I guess 8 * 8192 = 65536
>
>> 2. Max RAM are supported per node? (i think - unlimited, but..)
> No not unlimited, Linux currently supports 48- and 57-bit virtual addresses.
> So, depending on your CPU/Mainboard/... it's something between 2^48 = 256 TiB
> and 2^57 = 128 PiB.
>
> In practice the limit will be currently in the range of 6 TiB for modern (last gen)
> of Server CPUs. For example, with DDR5 you can get 512 GiB per DIMM and Epyc Genoa
> CPUs support 12 channels, so 12 * 512 GiB = 6 TiB.
>
> cheers,
> Thomas
>
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