DR error - (intermediate value) is not iterable

nuentes

Yesterday I migrated all of my VM disks to a temp disk and reformatted my primary VM disk storage from LVM (thick) to EXT4 (thin), and migrated them back. This all went mostly fine - all my VMs were back online before I went to bed. The only issue was that my overnight DR jobs failed with error "(intermediate value) is not iterable". I've googled a bit, and haven't really found an explanation of that error. Here is my failure log from XCP-ng:

 AlpineNUT (xcp-ng)

    Snapshot
    Start: 2025-08-16 06:54
    End: 2025-08-16 06:54
    Backup_STOR (897.6 GiB free - thin) - xcp-ng
        transfer
        Start: 2025-08-16 06:54
        End: 2025-08-16 06:54
        Duration: a few seconds
        Error: (intermediate value) is not iterable
    Start: 2025-08-16 06:54
    End: 2025-08-16 06:54
    Duration: a few seconds
    Error: (intermediate value) is not iterable

Start: 2025-08-16 06:54
End: 2025-08-16 06:54
Duration: a few seconds
Error: (intermediate value) is not iterable
Type: full

nuentes

I worked with ChatGPT on this for a bit. We have narrowed it down to an issue with the NFS Storage that I ship the backups to.

"When you recreated storage and moved data back, OMV is technically exporting a different underlying filesystem object than before. NFS clients that had an old handle cached (your XCP-ng host) try to access it and get ESTALE. That explains the initial backup errors and why deleting/re-adding the SR is failing now."

I had to remove the NFS storage from XCP-ng, then delete the NFS share from OMV, then add the NFS share back to OMV, and then add it back to XCP-ng.

I probably could have resolved this with a reboot, but I didn't wanna. This issue is resolved now.