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Mounting filesystem on logical volume inside virtual whole-disk image

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http://serverfault.com – I have tried to mount a virtual disk image on my Fedora host using the command qemu-nbd -c /dev/ndb0 rawhide.img and then detecting the LVM logical volumes and mounting the one I wanted. Obviously, the virtual machine is not running - I'm not stupid. However, because I have found this to be unreliable (nbd dies after a while), and also slow, I have decided to just copy the filesystem into a subdirectory of my home directory: cp -a /mnt/rawhide . However, I can't even get nbd to stay alive long enough to do the copy! It just died after less than one minute! I can't use the fast offset= t (HowTos)