The minimum vSAN disk requirement for VCF 4.1 management domain?

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Just encountered vsan disk availability validation failed when doing the "validate configuration" in cloud builder 4.1. as shown in figure below:

The target host for VCF 4.1 deployment had 1 SSD + 4 HDDs that failed to pass the validation.

So I check the vcf-bringup.log and found the error messages, as shown in figure below.

The weird part is, I tried 2 SSDs + 4 HDDs on each ESXi host to deploy VCF 4.1 and succeed!

but this time, the 1 SSD + 4 HDDs config. cannot pass and the log said cache/capacity ratio must be at least 1:7.

A little bit confused now.

Does any VMware employee know the exact vSAN cache/cap. minimum ratio for one or two disk groups on each management domain host?

Is it indeed that single disk group on a vSAN host should have 1:7 cache/cap. ratio (and more) to deploy VCF? Why my previous config. of 2 SSDs + 4 HDDs on each host can pass VCF bring-up validation?

Thanks

[toffaha1 · Accepted solution]

Hi,

Please check this https://core.vmware.com/resource/planning-hardware-requirements-vmware-cloud-foundation-management-d...

Hope that helps,

BR,

Muhammad Toffaha

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@toffaha1That is useful.

However, I still doubt the true minimum size of the vSAN cache/capacity but don't wanna spend time to test it for now.