[Qemu-devel] [Bug 1155677] Re: snapshot=on fails with non file-based storage

[Stefan Hajnoczi]

** Changed in: qemu
       Status: New => In Progress

** Changed in: qemu
     Assignee: (unassigned) => Stefan Hajnoczi (stefanha)

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https://bugs.launchpad.net/bugs/1155677

Title:
  snapshot=on fails with non file-based storage

Status in QEMU:
  In Progress

Bug description:
  The snapshot=on option doesn't work with an nbd block device:

  /usr/bin/qemu-system-x86_64 \
  [...]
      -device virtio-scsi-pci,id=scsi \
      -drive file=nbd:localhost:61930,snapshot=on,format=raw,id=hd0,if=none \
      -device scsi-hd,drive=hd0 \
  [...]

  gives the error:

  qemu-system-x86_64: -drive
  file=nbd:localhost:61930,snapshot=on,format=raw,id=hd0,if=none: could
  not open disk image nbd:localhost:61930: No such file or directory

  If you remove the snapshot=on flag, it works (although that of course
  means that the block device is writable which we don't want).

  Previously reported here:

    http://permalink.gmane.org/gmane.comp.emulators.qemu/148390

  and I can confirm this still happens in qemu 1.4.0.

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