Restored Backups Do Not Boot
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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.
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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.
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I got a VM to boot into an Ubuntu live CD and could see the disk and its respective partitions, and LVM setup.
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So you can access all data? Have you try to chroot in it, check grub?
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@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.
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That's weird, you are the first one to report this, so I wonder what's different in your environment
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@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.
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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! -
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