Shrinking A RAID Array

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My google-fu appears to be weak today…

I currently have 8*4Tb in a RAID6.

So far I’m only using 6Tb
PV VG Fmt Attr PSize PFree Used
/dev/md6 Large lvm2 a– 21.83t 15.37t 6.46t

Let’s say I wanted to remove 2 of these disks from the array and shrink it down to a 6*4Tb

How would I do this?

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