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