Refer to Removing an Old Disk in LVM HOWTO.
The process to remove
sdb from VG
vg is as follows.
First, distribute old extends from
sdb to other PV
# pvmove /dev/sdb
it will take much time.
# vgreduce vg /dev/sdb
Now, you can physically remove the
Then you can add new disks and extend the VGs.