Re: [Nbd] [Qemu-devel] Hibernate and qemu-nbd
On 9/26/13 10:18 PM, "Stefan Hajnoczi" <stefanha@...17...> 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..
Thank you for all your attention on this.
Best Regards,
Mark T.
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