Hi. On advice from Alex Bligh I'd like to ping linux-block and nbd-general about the issue described here: https://github.com/NetworkBlockDevice/nbd/issues/44
What basically happens is, that with a recent kernel (Linux heisenberg 4.9.0-1-amd64 #1 SMP Debian 4.9.2-2 (2017-01-12) x86_64 GNU/Linux), when a device larger than something between 1 TiB and 2 TiB is exported via nbd-server and connected to via nbd-client (which uses the kernel driver, AFAIU) than the device size gets insanely large while reading from /dev/nbd0 gives actually nothing. The bug does not seem to happen when the kernel is not involved (we tried using nbd-server and qemu-img as the client). Don't think it makes all too much sense to copy & paste everything from what was tried already for testing here, so please have a look at the issue on github. Best, Chris.
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