Help with setting device-class rule on pool without causing data to move

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Hi All

I'm trying to set the existing pools in a Luminous cluster to use the hdd device-class but without moving data around. If I just create a new rule using the hdd class and set my pools to use that new rule it will cause a huge amount of data movement even though the pgs are all already on HDDs.

There is a thread on ceph-large [1] which appears to have the solution but I can't get my head around what I need to do. I'm not too clear on which IDs I need to swap. Could someone give me some pointers on this please?

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