We all know there's a file size limit 16TB in ext4 and other fs has their
limit,too.

If I create an qcow2 20TB on ext4 and write to it more than 16TB. Data more
than 16TB can't be written to qcow2.

So, is there any better ways to solve this situation?

What I thought is to create new qcow2 called qcow2-new and setup the
backing file be the previous qcow2.

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