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+
+
+qemu_img convert and drive mirror migrate the same raw disk to rbd volume, will get the different USED size in ceph cluster.
+Description of problem:
+qemu_img convert and drive mirror migrate the same raw disk to rbd volume, will get the different USED size in ceph cluster.
+Steps to reproduce:
+create raw and qcow2 disk
+
+1. qemu-img create -f raw lvm_volume_1.raw 12G
+2. qemu-img create -f qcow2 lvm_volume_1.qcow2 12G
+
+   install a centos OS
+
+3. qemu-system-x86_64 -m 4096 -drive file=lvm_volume_1.qcow2,format=qcow2,index=0 -nographic -cdrom CentOS-8.3.2011-x86_64-dvd1.iso -vnc :25
+
+   convert the qcow2 OS disk to q raw OS disk
+
+4. qemu-img convert -f qcow2 -O raw ./lvm_volume_1.qcow2 ./lvm_volume_1.raw
+
+   create a qemu-rbd process
+
+5. qemu-nbd --fork  -x node1 -p 1238 rbd:cephpool- test/volume_1:id=xxx:key=xxx:mon_host=xxx:auth_supported=cephx
+
+   boot the raw OS disk
+
+6. qemu-system-x86_64 -hda ./lvm_volume_1.raw -m 4096 -smp 4 -vnc :25 -monitor stdio
+   
+   migrate the raw OS disk to a ceph volume
+
+7. drive_mirror -n  -f #block125 nbd:localhost:1238:exportname=node1 raw
+   
+   check the rbd volume USED size in ceph cluster
+   "rbd du cephpool-test/volume_1"
+   the ceph rbd volume PROVISION and USED are the same size
+
+   convert the raw OS disk to a ceph volume
+
+8. qemu-img convert -n -f raw -O raw ./lvm_volume_1.raw rbd:cephpool- 
+test/volume_2:id=xxx:key=xxx:mon_host=xxx:auth_supported=cephx
+
+   check the rbd volume USED size in ceph cluster 
+   "rbd du cephpool-test/volume_2"
+   the ceph rbd volume PROVISION and USED are different PROVISION > USED
+Additional information:
+