Add new disk without reboot:
echo "- - -" | tee /sys/class/scsi_host/host*/scan

Rescan disk after resize without reboot
echo 1 > /sys/block/sdX/device/rescan

pvresize /dev/sdb
Check the volume group (VG) size: vgdisplay
lvresize -l +100%FREE /dev/mapper/vol1-lvol0
resize2fs /dev/mapper/vol1-lvol0