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Similar problem converting vmdk to qcow2 qemu-img: Could not open 'image.vmdk': Could not open backing file: Unknown protocol I used export to ova/ovf in vmware which made a different vmdk output which qemu-img accepted and converted just fine.


Q: Is there a way to detect presence of snapshot from within VM guest OS* A: not that I know. However, you can use the sg_vpd to check if UNMAP is supported. For example: # sg_vpd /dev/sdb -p lbpv Logical block provisioning VPD page (SBC): Unmap command supported (LBPU): 1 Write same (16) with unmap bit supported (LBWS): 0 Write same (10) with unmap bit ...

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