Windows Server 2012 Image restore from FreeNAS server fails error 0x80070001

UPDATE: I have ordered a 8TB drive to be delivered tomorrow. My working theory is while Windows Server let me backup to the FreeNAS CIFS share, that on restoration Windows is being finicky about the CIFS and wants NTFS. I'll check that theory by formatting the 8TB drive when it arrives to NFTS and then copying the over 6TB system image from FreeNAS onto it. Plug it the drive direct into the server and attempt the restore again. Still looking for any other thoughts or confirmations.

ORIGINAL POST I have a complete system image of my Windows Server 2012 system. This image is on my FreeNAS server.

I updated my RAID 5 on my Windows Server with larger disks from a 4 x 4TB to 4 x 8TB and got caught flat with the whole over 16TB limit due to drives being made with 4K clusters and needing to be 64K clusters to expand beyond 16TB. So I made sure my backup images were good and started to restore the system image, which would then reformat the volume at the larger cluster size.

Booted up the Windows 2012 disk into repair mode and set it to restore the image. No problems getting it to see the path to the FreeNAS server. No problems with it finding the backup image.

I start the re-image and the system says it is preparing and then about 30 seconds in it says:

Restoring Disk (EFI System Partition)

Then I get the below error:

The system image restore failed.
Error details: Incorrect function. (0x80070001)

I've looked up this error code and can't really find anything relevant to my issue.

And, of course, the system image ran just enough to so that I can't reboot my server.

I don't want to mess with anything further until I get some advice. I'm stuck with what to do here.

Any help/advice/idesa are appreciated!

It is good you are taking a breather. And you came to the right place for advice.

When you are ready, it is time to put on your detective hat and work the case methodically.

First off, your first data point is that you have verified that you have a good image backup.

Second, you have one clue that might be relevant: The cluster size difference.

I presume you still have the original 4 drives from your former RAID5, so reinstall those drives and go back to your original configuration.

If you have trouble rebuilding the original RAID setup, do the best you can even if it means starting with it blank.

If it works, that is great but it does not validate your restore program.

If you have to restore the image into that new (older) configuration, do so.

When that works then you have a second clue: possibly the total size difference.

And you also have one more data point: You have now validated the restore program.

--> Then breathe a sigh of relief. Take a walk and Praise the Lord that He created the idea of making backups, and pat yourself on the back for doing it.

Then at that point you have restored service which will buy you time to investigate the FreeNAS restore error.

I would be surprised if the cluster size is the issue, but from what you've written it is a distinct possibility.

Yet it may not be the culprit. It may simply be that the restore program is having trouble with the overall size of the target RAID set.

So then, work the case using the clues you have.

Google is your friend. Certainly you can't be the first to have had this problem.

FYI: I have had to solve issues just like this, but in the pre-Google days. You are very fortunate to have this issue in 2017 instead of 1997. ;-)

Good luck in your investigation.

Any more information on this issue can be put into comments below either your question or this answer.