dev]# ls sd*
sda  sda1  sda2  sdb  sdb1
dev]# ls /sys/class/scsi_device/
0:0:0:0  0:0:1:0  2:0:0:0
[root@lsaa21d dev]# echo 1 > /sys/class/scsi_device/0:0:0:0/device/rescan
[root@lsaa21d dev]# echo 1 > /sys/class/scsi_device/0:0:1:0/device/rescan
[root@lsaa21d dev]# echo 1 > /sys/class/scsi_device/2:0:0:0/device/rescan

dev]# fdisk -l

Disk /dev/sdb: 96.6 GB, 96636764160 bytes, 188743680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x283108d4

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048   146800639    73399296   83  Linux    <<< Volume to expand
/dev/sdb2       146800640   188743679    20971520   83  Linux    <<< Drive expansion

Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000e448c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048   167772159    83373056   8e  Linux LVM

Disk /dev/mapper/rhel_lor9p-root: 51.6 GB, 51636076544 bytes, 100851712 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/rhel_lor9p-swap: 8455 MB, 8455716864 bytes, 16515072 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/rhel_lor9p-home: 25.2 GB, 25211961344 bytes, 49242112 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

dev]# pvcreate /dev/sdb2
  Physical volume "/dev/sdb2" successfully created.

dev]# vgdisplay
  --- Volume group ---
  VG Name               rhel_lor9p
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               79.51 GiB
  PE Size               4.00 MiB
  Total PE              20354
  Alloc PE / Size       20338 / 79.45 GiB
  Free  PE / Size       16 / 64.00 MiB
  VG UUID               2IY7ZG-H4yn-1RrK-eHUI-RxSd-T8Qi-faCBAV

dev]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               rhel_lorx19p
  PV Size               79.51 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              20354
  Free PE               16
  Allocated PE          20338
  PV UUID               ToJPjk-ICWd-KG2T-Rjl0-88Lj-q4zR-e16HuK

  "/dev/sdb2" is a new physical volume of "20.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb2
  VG Name
  PV Size               20.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               BdzW42-Yi8u-priM-Uuiy-Z8B2-aaLP-1WS4vh

dev]# lvextend -L+20G /dev/rhel_lorx19p/u01
  Logical volume u01 not found in volume group rhel_lorx19p.