Hello Damien,

Dual boot is something we don't support, but I know that it can be done, just it's not supported by Dell.

That said you can try:

*Change the boot order in the BIOS when you want to boot to the other USB

Or

*Use the F11 boot menu, in POST, See if it gives you the option to select which USB you want to boot from.

I would recommend use a supported Operating system:

PowerEdge R710 supports these operating systems:

VMware ESXi 6.0  (the latest supported on the R710). It is not validated for ESXi 6.5.

https://dell.to/3ubXMl2

thanks do you have any idea what they meant about the scracth file please

Hello Damien,

These vmware resource and a 3rd party write up may help you:

Follow the steps in VMware Knowledge Base article https://dell.to/3F9aENy to point scratch space and system logs to persistent storage (SSD or HDD drive partitions), in your PowerEdge Server.

Set the Scratch Partition from the vSphere Client : https://dell.to/2ZFrOCh

Move ESXi scratch location : https://dell.to/3inDSid

thanks