This is a report of what is currently known.
Here, "bootable" refers to whether or not GRUB boots up.
First, both the CORE and SCALE installers are bootable.
In the case of CORE, it is bootable after installation.
In the case of SCALE, it is bootable only if you upgrade from CORE to SCALE via ISO ("Install/Upgrade" > "Upgrade Install" > "Install in new boot environment"). It is not possible to boot after "Fresh Instal" and "Format the boot device".
These results suggest that the boot configuration, partitioning, etc. may be different when upgrading from CORE to SCALE via ISO using a specific procedure versus a clean install of SCALE.
The ultimate goal is to get GRUB up and running even with SCALE doing a clean install, but what you want to do as a must is to create a 16GB swap partition on the installer to the boot device and use SCALE (even by means of upgrading from CORE Worst case scenario is fine.)
The BIOS settings have not been changed from the bootable configuration in CORE, so that seems fine.
We have also confirmed that all of the above installation methods are successfully bootable on multiple other machines.
Similar threads include
www.truenas.com
Installer used
[CORE]
TrueNAS-13.0-U1.1.iso
[SCALE]
TrueNAS-SCALE-22.02.2.1.iso
TrueNAS-SCALE-22.02.2.iso
TrueNAS-SCALE-22.02.1.iso
Best regards.
Here, "bootable" refers to whether or not GRUB boots up.
First, both the CORE and SCALE installers are bootable.
In the case of CORE, it is bootable after installation.
In the case of SCALE, it is bootable only if you upgrade from CORE to SCALE via ISO ("Install/Upgrade" > "Upgrade Install" > "Install in new boot environment"). It is not possible to boot after "Fresh Instal" and "Format the boot device".
These results suggest that the boot configuration, partitioning, etc. may be different when upgrading from CORE to SCALE via ISO using a specific procedure versus a clean install of SCALE.
The ultimate goal is to get GRUB up and running even with SCALE doing a clean install, but what you want to do as a must is to create a 16GB swap partition on the installer to the boot device and use SCALE (even by means of upgrading from CORE Worst case scenario is fine.)
The BIOS settings have not been changed from the bootable configuration in CORE, so that seems fine.
We have also confirmed that all of the above installation methods are successfully bootable on multiple other machines.
Similar threads include
HP Gen8 Microserver Boot Issues
Hi eveyone I am trying to install scale on a gen8 microserver. The installation of Truenas Scale appears to install sucessfully however I am unable to make the system boot once the system reboots after installation. I can successfully install Core on the same harware and this boots without any...

Installer used
[CORE]
TrueNAS-13.0-U1.1.iso
[SCALE]
TrueNAS-SCALE-22.02.2.1.iso
TrueNAS-SCALE-22.02.2.iso
TrueNAS-SCALE-22.02.1.iso
Best regards.