On Thu, Oct 10, 2013 at 11:15 AM, Stefan Hajnoczi <stefa...@gmail.com> wrote: > 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..
Could you try drop the umount/mount and capture the following straces: strace -p $(pgrep nbd-client) -o /var/tmp/nbd-client.strace strace -p $(pgrep qemu-nbd) -o /var/tmp/qemu-nbd.strace In particular, let's find out what happens when you run ls /mnt after resuming the machine. The nbd-client should reconnect to qemu-nbd and I/O requests would flow to qemu-nbd again. But something is stuck; the problem might be clear from the strace output. Stefan ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk _______________________________________________ Nbd-general mailing list Nbd-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nbd-general
