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

[Richard Jones]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New

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

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

Status in QEMU:
  New

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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