no qemu-img process ,, but i found that it hanged on :
root 30850 0.0 0.0 114740 2924 ? S Sep21 0:00 /bin/sh -f
/usr/sbin/xfs_mkfile -n 81257582592 /mnt/transfer/ovirtbackupexample.ova.tmp
root 30853 0.0 0.0 152756 2300 ? D Sep21 0:00 /usr/sbin/xfs_io -p
xfs_mkfile -ft -c truncate 81257582592 -- /mnt/transfer/ovirtbackupexample.ova.tmp
strace showed,that these processes do nothing,,, so i killed 30850 .
after kill, file /mnt/transfer/ovirtbackupexample.ova.tmp was created (strange ,i
know) ,,, task failed,, snapshot from VM was removed automatically and VM was unlocked.
So issue was fixed.
After this i removed already existed snapshot (forgotten , few months) on VM and try
export again ... export was succesfull and also import was smoothly.
when i will have free time, i will try to do export of VM with already existed snapshot.
BR
jan