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How to adjust the qcow2 cluster size of existing images to drastically improve I/O performance?

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Hi

I've just read this interesting blog article on jrs-s.net (he have a lot of great articles on ZFS by the way) on the topic of qcow2 vs zvol I/O performance.

The interesting part was that fine-tuning the qcow2 cluster_size to match the record size ot the underlying zfs dataset could drastically improve the I/O performance of qcow2 images (3x the performance of zvol in some scenarios).

So my question is simple: Is there a...

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