On Fri, Oct 04, 2013 at 07:30:45AM -0700, Mark Trumpold wrote: > > > On 9/26/13 10:18 PM, "Stefan Hajnoczi" <stefa...@gmail.com> wrote: > > > > >Try the qemu-nbd --persistent option. That should prevent it from > >shutting down when nbd-client is disconnected. > > > >Stefan > > > > > Hi Stefan, > > Sorry for the delay.. > I tried the following per your suggestion: > > 920 qemu-nbd --persistent -p 2000 /root/qemu/q1.img & > 921 nbd-client -persist localhost 2000 /dev/nbd0 > 922 fsck /dev/nbd0 > 923 mount /dev/nbd0 /mnt > 924 ls /mnt > 925 umount /dev/nbd0 > :: > > 927 echo reboot >/sys/power/disk > 928 echo disk >/sys/power/state > 929 mount /dev/nbd0 /mnt > > This seems to work; that is both sides (client and server) persist > after the hibernate cycle. > > However, if I don't 'umount' '/dev/nbd0' before the hibernate > cycle, and try to 'ls /mnt' after, the 'ls' hangs indefinitely. > > For my real use case we have the root filesystem mounted, > so unmounting is not an option (at least I don't think so). > > I also tried remounting readonly, and also 'blockdev --flushbufs ..' > before the hibernate cycle -- either or both did not help. > > I had thought about trying a 'chroot' and then a 'umount', but > have not yet tried this. > > This one was so close..
Too bad. I'm sure it's solvable but would require more debugging and writing qemu-nbd.c and kernel nbd.c fixes. Unfortunately I don't have time to look into it myself. Stefan
