[Bug 1816805] Re: Cannot create cdrom device with open tray and cache option

[John Snow]

Hi, versions 2.5 and 2.11 are quite old (though version 2.10 fixed the
bug mentioned in the Red Hat BZ, so I think this might be a different
bug.)


It's not clear at what step this is failing or where you are seeing the error 
message, so:

1. What is your full command line for QEMU?
2. Do you see this error message when migrating? If so, what does the 
destination QEMU command line look like?
3. Does the problem reproduce on a currently-supported upstream QEMU? (4.1.1, 
4.2.0)

** Changed in: qemu
       Status: New => Incomplete

** Changed in: qemu
     Assignee: (unassigned) => John Snow (jnsnow)

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https://bugs.launchpad.net/bugs/1816805

Title:
  Cannot create cdrom device with open tray and cache option

Status in QEMU:
  Incomplete

Bug description:
  When trying to create cdrom device with open tray and either of
  "cache" or "discard" options specified, I get the following error:

  qemu-system-x86_64: -drive if=none,id=drive-
  ide0-0-0,readonly=on,cache=writeback,discard=unmap,throttling.iops-
  total=900: Must specify either driver or file

  This bug essentially forbids live migration of VMs with open cdrom
  trays.

  I was able to find the same bug at RedHat:
  https://bugzilla.redhat.com/show_bug.cgi?id=1338638

  The bug was encountered in versions 2.5 and 2.11.

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