[Qemu-devel] [Bug 1354167] Re: On VM restart: Could not open 'poppy.qcow2': Could not read snapshots: File too large

[Nenad Cuturic]

Todd, thank you for your post and advise. It helped me to fix the same problem 
with one of the virtual disks that became corrupted after ubuntu host release 
upgrade to 14.0.1 LTS
I tried first to install qemu 2.1.2 from sources but without any improvement.
qemu 1.7.2 could convert to raw img format and my VM is up and running now.
Seems like your work around is the only available on the Internet so thanks a 
lot :)

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https://bugs.launchpad.net/bugs/1354167

Title:
  On VM restart: Could not open 'poppy.qcow2': Could not read snapshots:
  File too large

Status in QEMU:
  New

Bug description:
  I'm unable to restart a VM.   virt-manager is giving me:

  Error starting domain: internal error: process exited while connecting
  to monitor: qemu-system-x86_64: -drive
  file=/var/lib/libvirt/images/poppy.qcow2,if=none,id=drive-virtio-
  disk0,format=qcow2: could not open disk image
  /var/lib/libvirt/images/poppy.qcow2: Could not read snapshots: File
  too large

  
  From the command line trying to check the image also gives me:
  qemu-img check poppy.qcow2
  qemu-img: Could not open 'poppy.qcow2': Could not read snapshots: File too 
large

  
  This bug appears with both the default install of qemu for ubuntu 14.04:
  qemu-img version 2.0.0, Copyright (c) 2004-2008 Fabrice Bellard

  And the latest version.
  qemu-img version 2.1.50, Copyright (c) 2004-2008 Fabrice Bellard

  
  Host: 
  Dual E5-2650 v2 @ 2.60GHz
  32GB Memory
  4TB Disk space (2.1TB Free) 

  Host OS: Ubuntu 14.04.1 LTS 64bit

  Guest:
  Ubuntu 14.04 64bit
  Storage Size: 500gb

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