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In your case /dev/sda1 is already mounted as root file system - you cannot make PV on it. It will be better if you will have a second HDD, or even to have RAID for it (depending on your needs). If you want only prove idea you need to make empty partition for PV.

for example. make /dev/sda1- for root fs - I think 20GB will be enough /dev/sda2 - for SWAP for example 5G as in your case /dev/sda3 - all other space - is about 800G for PV for cinder-volumes

when you make pvcreate /dev/sda3 ... vgcreate cinder-volumes /dev/sda3 ... and so on