Coredump partition sizing on a vSAN

Source: https://www.vexpertconsultancy.com/2018/03/coredump-partition-sizing-on-a-vsan-6-6-esxi-node/

Source: https://core.vmware.com/resource/vmware-vsan-design-guide#sec6864-sub4

Core Dump  

Without vSAN activated: 

For every 1 TB of DRAM, there should be a core dump size partition of 2.5 GB

With vSAN OSA activated: 

In addition to the core dump size, the physical size of the size of caching tier SSD(s) in GB will be used as the basis of calculation the additional core dump size requirements

The base requirement for vSAN is 4GB

For every 100GB cache tier, 0.181GB of space is required

Every disk group needs a base requirement of 1.32 GB

Data will be compressed by 75%

Example: 

ESXi 1.5TB RAM + vSAN ESA Enabled

(2.5 GB + 1.25 GB) for ESXi RAM + 4 GB for vSAN = 7.75 GB

75% compression of 7.75 GB = 1.9375 GB ~= 2 GB