1. insert the disks in the slots.
2. check the device
   # ls /dev/sd*

3. create partitions, assuming /dev/sdd is the new disk.
   # fdisk /dev/sdd

4. create a physical volume.
   # pvcreate /dev/sdd1

5. extend the centos volume group.
   # vgextend centos /dev/sdd1

6. extend the centos/home logical volume upto 100% of the free space.
   # lvextend -l +100%FREE /dev/centos/home

7. grow the centos/home logical volume file system.
   # xfs_growfs /dev/centos/home

8. grow the centos/home logical volume file system.
   # vgdisplay # check the volume group info
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 4
Max PV 0
Cur PV 3
Act PV 3
VG Size <5.46 TiB
PE Size 4.00 MiB
Total PE 1430487
Alloc PE / Size 1430487 / <5.46 TiB
Free PE / Size 0 / 0
VG UUID xasdf-wqpe-askdjw-erpx-z5Ov


display the physical volume info
# pvdisplay
--- Physical volume ---
PV Name /dev/sdb3
VG Name centos
PV Size <1.82 TiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476625
Free PE 1
Allocated PE 476624
PV UUID Jcx0x8-zt4I-K69K-t5z1-UE00-i5g3-jHob1x


display the logical volume info
# pvdisplay
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID 6SApg8-ADnV-02bb-MakZ-pVmj-VA7g-5A8nP3
LV Write Access read/write
LV Creation host, time localhost, 2018-08-07 06:32:52 +0800
LV Status available

LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID Xv9arG-bAzV-CYx0-Ft2y-7P2K-RzG0-QSd20K
LV Write Access read/write
LV Creation host, time localhost, 2018-08-07 06:32:59 +0800
LV Status available

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