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+hypervisor: 0.956
+risc-v: 0.947
+virtual: 0.934
+device: 0.917
+vnc: 0.861
+performance: 0.815
+ppc: 0.803
+PID: 0.760
+files: 0.751
+kernel: 0.747
+architecture: 0.746
+VMM: 0.745
+register: 0.738
+network: 0.724
+graphic: 0.711
+socket: 0.666
+boot: 0.615
+debug: 0.588
+i386: 0.574
+assembly: 0.573
+arm: 0.555
+peripherals: 0.555
+x86: 0.528
+KVM: 0.527
+semantic: 0.518
+permissions: 0.516
+user-level: 0.487
+TCG: 0.455
+mistranslation: 0.273
+
+qemu-img cannot repair a qcow2 in an LV because size is mis-detected when qcow2 is on an LV
+Description of problem:
+This is RHEV with Tb's of VMs which need to be repaired due to a datacenter-wide (the real datacenter) power outage.
+
+Each of these VMs are on individual LVs but qemu-img check fails to perform repairs:
+
+
+```
+ERROR cluster 24481205 refcount=0 reference=1
+ERROR cluster 24481206 refcount=0 reference=1
+Rebuilding refcount structure
+ERROR writing refblock: No space left on device <============
+qemu-img: Check failed: No space left on device
+```
+
+Running qemu-img check or info on the LV (/dev/dm-*) works well but repairs cannot be completed:
+
+```
+# qemu-img info /dev/cdd4e215-8c6b-4877-b2be-fdba383e7eb0/fb32333b-2334-4e10-8c42-02bc97e826cc
+image: /dev/cdd4e215-8c6b-4877-b2be-fdba383e7eb0/fb32333b-2334-4e10-8c42-02bc97e826cc
+file format: qcow2
+virtual size: 1.5 TiB (1649267441664 bytes)
+disk size: 0 B <================================
+cluster_size: 65536
+Format specific information:
+    compat: 1.1
+    compression type: zlib
+    lazy refcounts: true
+    refcount bits: 16
+    corrupt: false
+    extended l2: false
+```
+Steps to reproduce:
+1. Have a damaged VM with its qcow2 in an LV
+2. run 'qemu-img check <device>' verify that it properly detects the blocks which need fixing.
+3. run 'qemu-img check -r all <device>', it exits with 'no space left on device´ after a few seconds.
+Additional information:
+https://bugzilla.redhat.com/show_bug.cgi?id=1519071
+
+
+Here is one example: