[Qemu-devel] [Bug 1450891] Re: VM will not resume on GlusterFS

[Kevin Wolf]

We can't just reopen files, we don't know what state they are in. Any
data that has been written to the image between the last flush and the
point where gluster made the fd invalid may be there or may be missing.
If any data is missing, we can't continue the guest or you'll get data
corruption.

The correct fix for resuming after I/O errors is on gluster. As long as
it invalidates the fd, without a way to resume, there is no way for qemu
to correctly continue after an error.

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https://bugs.launchpad.net/bugs/1450891

Title:
  VM will not resume on GlusterFS

Status in QEMU:
  New

Bug description:
  oVirt uses libvirt to run QEMU.
  Images are passed to QEMU as files, not file descriptors.
  When running images from a GlusterFS, the file descriptors may get 
invalidated because of network problems or the glusterfs process being 
restarted.
  In this case, the VM goes into paused state.
  When trying to resume the VM ('cont' command), QEMU uses the same invalidated 
file descriptors throwing a:
  "block I/O error in device 'drive-virtio-disk0': Transport endpoint is not 
connected (107)".

  Please check file-descriptors and reopen image file on 'cont' event in QEMU.
  Thanks.

  References:

  [1] http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg01269.html
  [2] https://bugzilla.redhat.com/show_bug.cgi?id=1058300

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