How to extend xfs root partition

[root@host-192-168-0-10 ~]# lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTP
vda           252:0    0  100G  0 disk
├─vda1        252:1    0  500M  0 part /boot
└─vda2        252:2    0 19.5G  0 part
  ├─rhel-root 253:0    0 17.5G  0 lvm  /
  └─rhel-swap 253:1    0    2G  0 lvm  [SWAP]
[root@host-192-168-0-10 ~]# df -h
Filesystem             Size  Used Avail Use%
/dev/mapper/rhel-root   18G  4.1G   14G  23%
devtmpfs               1.9G     0  1.9G   0%
tmpfs                  1.9G   84K  1.9G   1%
tmpfs                  1.9G  8.7M  1.9G   1%
tmpfs                  1.9G     0  1.9G   0%
/dev/vda1              497M  158M  339M  32%
tmpfs                  380M   16K  380M   1%
tmpfs                  380M     0  380M   0%

# fdisk /dev/sda
To create new partitions for the OS to use. These new partitions will be added to the VG so we can extend the LV that the “/” partition is on. My newly created partition in the example is /dev/sda3. For new disks you would use /dev/sdb, or /dev/sdc. If you are using an extended /dev/sda like in my case, you will need to reboot for the changes to be seen
[root@host-192-168-0-10 ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).


Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.




Command (m for help): p


Disk /dev/vda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000e92ca


   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     1026047      512000   83  Linux
/dev/vda2         1026048    41943039    20458496   8e  Linux LVM


Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p): p
Partition number (3,4, default 3):
First sector (41943040-209715199, default 41943040):
Using default value 41943040
Last sector, +sectors or +size{K,M,G} (41943040-209715199, default 209715199):
Using default value 209715199
Partition 3 of type Linux and of size 80 GiB is set


Command (m for help): p


Disk /dev/vda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000e92ca


   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     1026047      512000   83  Linux
/dev/vda2         1026048    41943039    20458496   8e  Linux LVM
/dev/vda3        41943040   209715199    83886080   83  Linux


Command (m for help): w
The partition table has been altered!


Calling ioctl() to re-read partition table.


WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@host-192-168-0-10 ~]# partprobe

[root@host-192-168-0-10 ~]# lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
vda           252:0    0  100G  0 disk
├─vda1        252:1    0  500M  0 part /boot
├─vda2        252:2    0 19.5G  0 part
│ ├─rhel-root 253:0    0 17.5G  0 lvm  /
│ └─rhel-swap 253:1    0    2G  0 lvm  [SWAP]
└─vda3        252:3    0   80G  0 part

[root@host-192-168-0-10 ~]# pvcreate /dev/vda3
  Physical volume "/dev/vda3" successfully created

[root@host-192-168-0-10 ~]# vgs
  VG   #PV #LV #SN Attr   VSize  VFree
  rhel   1   2   0 wz--n- 19.51g 40.00m
[root@host-192-168-0-10 ~]# vgextend rhel /dev/vda3
  Volume group "rhel" successfully extended
[root@host-192-168-0-10 ~]# vgs
  VG   #PV #LV #SN Attr   VSize  VFree
  rhel   2   2   0 wz--n- 99.50g 80.04g
[root@host-192-168-0-10 ~]# lvs
  LV   VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root rhel -wi-ao---- 17.47g                                          
  swap rhel -wi-ao----  2.00g                                          

[root@host-192-168-0-10 ~]# lvextend -L +80G /dev/rhel/root
  Size of logical volume rhel/root changed from 17.47 GiB (4472 extents) to 97.47 GiB (24952 extents).
  Logical volume root successfully resized.

[root@host-192-168-0-10 ~]# lvs
  LV   VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root rhel -wi-ao---- 97.47g                                          
  swap rhel -wi-ao----  2.00g                                          

Online resize of the actual filesystem now on that LV
[root@host-192-168-0-10 ~]# xfs_growfs /dev/rhel/root
meta-data=/dev/mapper/rhel-root  isize=256    agcount=4, agsize=1144832 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=4579328, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 4579328 to 25550848

[root@host-192-168-0-10 ~]# df -h
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root   98G  4.1G   94G   5% /
devtmpfs               1.9G     0  1.9G   0% /dev
tmpfs                  1.9G   84K  1.9G   1% /dev/shm
tmpfs                  1.9G  8.7M  1.9G   1% /run
tmpfs                  1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/vda1              497M  158M  339M  32% /boot
tmpfs                  380M   16K  380M   1% /run/user/42
tmpfs                  380M     0  380M   0% /run/user/0
[root@host-192-168-0-10 ~]#