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If you have cinder installed in that node, you need to create a pv in that disk, then add it to the existing cinder-volumes volume group with vgextend (see and

That works if you want to add additional volumes to your virtual machines.

If you are asking about the primary disk for virtual machines, they typically go in /var/lib/nova/instances. Likewise you can simply add that disk to whatever volume group contains /var/lib/nova/instances and then use lvextend, and resize2fs. Or you could format a new filesystem and mount /var/lib/nova/instances in the new disk.