UEFI vs. Legacy BIOS in Sangfor HCI: Should You Reinstall a Working Environment?
  

George Fady Lv2Posted 2026-Jul-15 21:53

One question I recently received from a customer was:
"Our Sangfor HCI cluster was installed using UEFI BIOS. Should we reinstall it using Legacy BIOS to avoid future issues?"
This is a common concern, especially when deploying HCI on third-party servers.
The Answer
Sangfor generally recommends Legacy BIOS for third-party servers because it offers broader compatibility during deployment.
However, UEFI is also fully supported, especially when:

  • The system disk is larger than 2 TB.

  • Legacy installation is not available or supported.

The important point is this:
If your HCI environment was successfully installed under UEFI and is running normally, there is no documented reason to reinstall it simply to switch to Legacy BIOS.
Changing the boot mode after installation may even prevent the server from booting correctly.
My Recommendation
For new deployments, Legacy BIOS is a good choice when supported by the hardware.
For existing, healthy UEFI deployments, leave the environment as it is. Reinstalling introduces unnecessary downtime and risk without providing a documented benefit.
Key Takeaway
Choose the correct boot mode before deployment, but don't rebuild a stable environment just to change from UEFI to Legacy.
Have you deployed Sangfor HCI using UEFI? I'd like to hear your experience.
ND Lv3Posted 2026-Jul-16 13:50
  
Great info. Thanks
Humayun Ahmed Lv4Posted 2026-Jul-16 12:54
  
Thanks to share!