[SOLVED] "Unsupported reserved bits" when importing Ubuntu-VM from vSphere

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ChrisTG74

Member
Nov 12, 2025
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I have a strange error with a single Ubunut 24 LTS VM that I try to import from vSphere:

TASK ERROR: unable to create VM 113 - cannot import from 'Import:ha-datacenter/<STORAGE>/<HOSTNAME>/<HOSTNAME>-000001.vmdk' - qemu-img: Could not open '/run/pve/import/esxi/Import/mnt/ha-datacenter/<STORAGE>/<HOSTNAME>/<HOSTNAME>-000001.vmdk': Unsupported reserved bits: 0x0000000000000200 0x0000000000000000 0x0000000000000000 0x0000000000000000

All other VM imports work quite fine. What could be the cause of this and how to work-around it?

TIA!
 
Okay, I think I found the reason myself: There was an old snapshot present in vSphere. After deletion, the import works.

However, it would be nice if such basic problems could be checked by the Proxmox-importer and a decent notification is displayed asking the user to remove the snapshots instead of only giving a cryptic error message IMHO.
 
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