IBM Support

BMR CD unexpectedly loads on UEFI system

Question & Answer


Question

A FastBack for Bare Machine Recovery CD can be booted on an UEFI system. This behavior does not seem consistent with the FastBack for BMR User's Guide which states: "Note: The FastBack for Bare Machine Recovery CD does not load on UEFI systems"

Cause

The restored operating system is on a MBR disk structure.

Answer

The BMR regular restore process using the BMR CD creates a MBR disk structure during the restore. If a user has created a backup of an UEFI operating system, this system is always installed on a GPT (GUID partition table disk) disk structure. To restore a UEFI operating system that is on GPT disk, follow the process for UEFI-platform machines described in the User's Guide.

For those machines where the BMR CD can be loaded on UEFI hardware, this UEFI processor has backward compatibility to work with MBR based disks and bootable CDs. That is the reason why the BMR CD is able to load. If the snapshot is based on a MBR disk, the regular BMR process can be used to restore it and the restored machine can be rebooted successfully since this UEFI hardware also supports MBR.

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Document Information

Modified date:
17 June 2018

UID

swg21574882