<![CDATA[Restored Backups Do Not Boot]]>I posted here originally

I have both Delta backups and full backups failing to restore properly from an NFS source. I have them throwing into a UEFI rescue mode. I have Debian Buster images doing this and Centos 8 with xo-server 5.81.2 and XCP-NG 8.2.0.

My original VM's are using Secure Boot with UEFI, I have learned that secure boot isnt supported by XCP-NG, and I have not tested non-UEFI VM's and their backups

I do not know what I am missing, nothing about the restore fails, they just will not boot.

]]>https://xcp-ng.org/forum/topic/5124/restored-backups-do-not-bootRSS for NodeSun, 17 May 2026 00:06:54 GMTThu, 28 Oct 2021 04:33:36 GMT60<![CDATA[Reply to Restored Backups Do Not Boot on Mon, 08 Nov 2021 07:58:32 GMT]]>Sure, please keep us posted on your experiments 🙂 If it's a bug, we'll have more info to be able to work on it!

]]>https://xcp-ng.org/forum/post/43714https://xcp-ng.org/forum/post/43714Mon, 08 Nov 2021 07:58:32 GMT<![CDATA[Reply to Restored Backups Do Not Boot on Mon, 08 Nov 2021 07:55:19 GMT]]>@olivierlambert I have swapped to normal full backups for now.

I have non-emergency need to recover at least one VM and have a couple options on how to do so since the data appears intact.

In all fairness to xcp-ng, the hardware we use is a mix of older machines (it is not a funded enterprise setup). I would be willing to provide your team specific hardware details among other things but I will be slow to gather info.

I will try out a delta backup of a bios VM as soon as I find the time. My only theory, which I have little evidence or ability to test, is that I have triggered a bug in the uefi firmware used by the VM. I can at least narrow down a bit more by comparing uefi versus legacy.

]]>https://xcp-ng.org/forum/post/43712https://xcp-ng.org/forum/post/43712Mon, 08 Nov 2021 07:55:19 GMT<![CDATA[Reply to Restored Backups Do Not Boot on Sun, 07 Nov 2021 09:17:29 GMT]]>That's weird, you are the first one to report this, so I wonder what's different in your environment 🤔

]]>https://xcp-ng.org/forum/post/43681https://xcp-ng.org/forum/post/43681Sun, 07 Nov 2021 09:17:29 GMT<![CDATA[Reply to Restored Backups Do Not Boot on Sun, 07 Nov 2021 02:22:09 GMT]]>@olivierlambert so I booted into Finnix, and was able to mount the root LVM and verify that the filesystem is intact and the files I expect to see are all there. The chroot environment is functional and I don't see anything worry about.

I was able to mount and rebuild the /boot through efi/EFI paths, I have not yet bothered checking file hashes or anything forensic, but I am seeing all the contents in the backups that I see in the running VM from which this backup originated.

One thing I have found, is that only deltas are failing to restore in bootable form. Full backups are fine. I tried to restore the periodic full snapshots within the delta cycles, but those aren't any better than restoring a later delta.

I will be switching to full backups only until I know why delta is broken in my environment.

]]>https://xcp-ng.org/forum/post/43680https://xcp-ng.org/forum/post/43680Sun, 07 Nov 2021 02:22:09 GMT<![CDATA[Reply to Restored Backups Do Not Boot on Fri, 29 Oct 2021 06:48:57 GMT]]>So you can access all data? Have you try to chroot in it, check grub?

]]>https://xcp-ng.org/forum/post/43496https://xcp-ng.org/forum/post/43496Fri, 29 Oct 2021 06:48:57 GMT<![CDATA[Reply to Restored Backups Do Not Boot on Fri, 29 Oct 2021 02:42:48 GMT]]>@olivierlambert

I got a VM to boot into an Ubuntu live CD and could see the disk and its respective partitions, and LVM setup.

]]>https://xcp-ng.org/forum/post/43494https://xcp-ng.org/forum/post/43494Fri, 29 Oct 2021 02:42:48 GMT<![CDATA[Reply to Restored Backups Do Not Boot on Thu, 28 Oct 2021 06:12:41 GMT]]>First, you need to check if it's a guest issue or not. Boot your failed restored VM with a live CD (Ubuntu or something else) and check if you can access the disks.

]]>https://xcp-ng.org/forum/post/43460https://xcp-ng.org/forum/post/43460Thu, 28 Oct 2021 06:12:41 GMT