How to migrate a pool from using 'straw' to 'straw2'?

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Issue

Ceph supports a new algorithm named 'straw2' for pools, from Hammer (0.94) onwards. How to convert a pool using 'straw' to 'straw2'?
What are the benefits of moving to 'straw2'?

Environment

Red Hat Ceph Storage 1.2.3
Red Hat Ceph Storage 1.3

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