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Date: Thu, 9 Mar 2017 12:26:41 +0000
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Subject: Re: [Qemu-devel] external snapshots freezes block device since qemu
 2.8
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To: Piotr Rybicki <piotr.rybicki@innervision.pl>
Cc: qemu-devel@nongnu.org, jsnow@redhat.com

* Piotr Rybicki (piotr.rybicki@innervision.pl) wrote:
> Hello there.
> 
> I discovered, that since qemu 2.8 , external snapshots (very similar to:
> http://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit),
> freezes block device after:
> 
> # virsh blockcommit (...)
> 
> There is no error message after completion of the command above.
> I'm using gluster + ZFS fuse mount as a storage for a VM on gentoo.
> libvirt debug showed nothing helpful.
> With qemu <2.8 -: snapshots are working as expected.
> 
> Is this a known issue?
> Is it qemu or libvirt ?
> 
> If it helps, how can i diagnose this further?

I don't know of it, cc'd in jsnow.
Have you tried bisecting?

Dave

> Thank You & Best regards
> Piotr Rybicki
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK