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1b1ed1a
(Get the code!)
I've been trying this on several platforms -
16.04 physical host
16.04 VMware
17.04 vmware
The script pasted below creates a virtual disk, writes a partition table, creates an fs and some thin pools, then verifies that writes happened as expected.
On 16.04 physical host it seems to be working (though I do need to manually dmremove the devices as seen in cleanup(), else a second run fails).
On the VMware hosted vms, the mkfs.ext4 fails to find nbd0p1: "The file /dev/nbd0p1 does not exist and no size was specified."
(I've had other - corruption - issues which are what I was trying to track down with this test script, but it's possible, not certain, that those all boil down to having to manually dmremove the devices)