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Its unclear why it worked with the lesser amount of memory but it looks like you will need to assign more memory for vSAN to function. See the memory consumption guide below:
Thanks for the quick reply. As mentioned in the link, I tried different scenarios with RAM greater than 22GB (one disk group per ESXi host) and every case worked. Thanks again for pointing to the document.
Still curious why it is working with 7.5GB RAM. I have tried up to 3 disk groups per ESXi host and vSAN works with 7.5GB RAM.