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ESXi 6.5 AHCI - Bad write performance

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Anyone able to resolve this?

I am wanting to put ESXi 6.5 on my MS loaded on to an SD card

Then run two 4tb in Raid 1 and two 256gb SSD in raid 0

Anyone got a step by step on how to fix this issue?

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Posted (edited)

I know this thread is 3 years old, but I was running into the exact same problem on proxmox. Great read speeds (exactly up to spec) but terrible writes (40mb/s on zfs mirrors or raidz). No matter what I hooked up to the b120i.


Turns out this happens if you disable Drive Write Cache under System Options > Sata controller options. When I enable it speeds are up to spec again. 


I hope this helps someone else keep his hair because I pulled mine out trying to fix this issue.

Edited by Dragundo

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