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one volume group solution

 pvcreate /dev/sdb
 vgextend vg0 /dev/sdb
 pvmove /dev/vg0/bar /dev/sda /dev/sdb

two volume group solution

 pvcreate /dev/sdb
 vgcreate vg1 /dev/sdb
 lvcreate -l100%FREE vg1
 mkfs -t ext4 /dev/vg1/lvol1
 mount /dev/vg1/lvol1 /mnt

now difficult part, all activities MUST stop on /bar

 cd /mnt ; ( cd /bat ; tar cf - * ) | tar xf -
 cd /
 umount /mnt
 mount /dev/vg1/lvol1 /bar

where

• pvcreate erase all data on disk (and prepare for LVM)
• lvcreate sould create a logical volume lvol1, you specify lv name with -n bar
• I use HP-UX syntax for lv, you might have to use /dev/mapper/myvg-mylv syntax

Once you have verified data are OK, in new place :

• you can safely delete old /bar
• edit /etc/fstab to use new /bar