pvresize - Resize a disk or partition in use by LVM2
To adjust the size of the physical volume /dev/sdb # pvresize /dev/sdb
To resize a physical volume, by reducing it # pvresize --setphysicalvolumesize 20G /dev/sdb
To set to debug mode # pvresize -d
To run pvresize in test mode # pvresize -t /dev/sdb
To set to verbose mode # pvresize -v
To get the help for pvresize # pvresize --help
regards, T.Dhanasekar