Use the pvmove command to move the data from /dev/sdb1 to /dev/sdd1.
[root@tng3-1 ~]# pvmove /dev/sdb1 /dev/sdd1
/dev/sdb1: Moved: 10.0%
...
/dev/sdb1: Moved: 79.7%
...
/dev/sdb1: Moved: 100.0%
[root@tng3-1]# pvs -o+pv_used
PV VG Fmt Attr PSize PFree Used
/dev/sda1 myvg lvm2 a- 17.15G 7.15G 10.00G
/dev/sdb1 myvg lvm2 a- 17.15G 17.15G 0
/dev/sdc1 myvg lvm2 a- 17.15G 15.15G 2.00G
/dev/sdd1 myvg lvm2 a- 17.15G 15.15G 2.00G
