Restore the Virtual BIOS
or UEFI
The
.nvram
file stores the BIOS or
UEFI customizations of a virtual machine. Usually the only important items in
this file are the boot drive setting and the boot order (in the case of
multiple virtual disks).
Newer releases of vSphere can change the boot
order using extended attribute settings, so boot order no longer must be stored
in the
.nvram
file. However some
users want to preserve a virtual machine’s serial port settings in the
.nvram
file, and possibly
other items, so applications should back up and restore this information.
To back up and restore NVRAM:
- For each virtual machine, make a separate copy of the.nvramfile.
- Back up each virtual machine using standard methods.
- If necessary, restore the virtual machine using standard methods.
- Overwrite the virtual machine’s.nvramfile with the saved copy of the original.nvramfile.VMware now recommends saving the.nvramfile as part of virtual machine backup, a change in recommendation since vSphere 4.1.