Hi,
On Lenovo System X servers (was IBM) it's always been that with ESXI 5.5 and 6.0 you had to change two uEFI settings to successfully install and boot ESXI.
PCI 64-Bit Resource Allocation from the default of Enabled to Disabled
MM Config Base from the default of 2GB to 3GB
This was for Intel servers with E5 processors v2, v3, and v4 generations which equates to the M4 and M5 models from IBM\Lenovo.
I'm sitting here with some new x3650 M5 servers with v4 processors. I just installed ESXI 6.5 on 3 of them. It installed and booted after install just fine with default settings. PCI 64-bit Resource Allocation is still the default of disabled and MM Config Base is set to the default of 2GB on these.
Any idea how these settings effect ESXi 6.5 or performance/stability? Should I leave them as default or change them to the recommended 5.5/6.0 settings?
Thoughts?! Also, I'm curious about HP and Dell people out there! When you get a new set of servers and need to install ESXi or some other hypervisor on them, how do you choose or set your uEFI values? Do you just accept defaults?