Setting the coredump partition when using vSAN
I was designing a customer vSAN deployment and I came across the guidelines and formula for calculating the required ESXi Coredump partition size: https://kb.vmware.com/s/article/2147881
Right away, I started working the formula for my customers deployment, when it occurred to me; this is WAY more complicated than it needs to be!
VMware actually wants you to take a number (the size of SSD in GB), divide by 100, multiply by 0.181 and then multiply by 0.25. Ridiculous!
- Why not just multiply by 0.0045, it is exactly the same thing!
Here is my, simplified way of calculating the coredump partition required for ESXi when using vSAN 6.5+:
| Multiplier | Worked example: 1 Disk Group, 1TB DRAM, 600GB SSD | |
| Base (3.981) | 0.995 | 0.995 |
| For every 100GB SSD | 0.00045 | .27 |
| For each disk group | 0.33 | 0.33 |
| For each TB DRAM | 2.56 | 2.56 |
| Total | 4.155 | |
Here is VMware’s much more complicated way of calculating the required coredump partition for vSAN:
