On 2018-03-22 13:17, Pascal wrote: > hi everybody, > > when I use `qemu-nbd -s -c /dev/nbd0 /dev/sda` where are changes to > /dev/ndb0 saved ? > I searched in /proc/{pid_of_qemu-nbd}/ but found nothing there... In snapshot mode, qemu (or in this case qemu-nbd) creates a temporary qcow2 file in $TMPDIR (or /var/tmp) which will get the changes. You should see a link to that file in /proc/$pid/fd, like this: lrwx------. [...] 10 -> /var/tmp/vl.JjYLDm (deleted) As you can see, the file is deleted right after it is opened, though. If you want to have control over where the data is stored, you can just create the overlay yourself, like so: $ qemu-img create -f qcow2 -b /dev/sda -F raw overlay.qcow2 $ qemu-nbd -c /dev/nbd0 overlay.qcow2 Max
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