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-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: