Slow SMB performance
Unraid SMB performance is very slow compared to SMB performance of a Windows Server VM running on the same Unraid hardware.
I tested using 6.7.0.
Test methodology and results are here:
https://blog.insanegenius.com/2019/06/10/unraid-in-production-a-bit-rough-around-the-edges-and-terrible-smb-performance/
server-1-diagnostics-20190611-0254.zip
Minor
I have now tested Unraid vs. W2K19 VM, and Ubuntu VM, and now Ubuntu bare metal on the same hardware.
There is no reason why Unraid should be slower on the cache drive, but the ReadWrite and Write performance is abysmal.
https://blog.insanegenius.com/2020/02/02/unraid-vs-ubuntu-bare-metal-smb-performance/