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# qemu-img  info /opt/data/kvm/images/hello_kvm.img
image: /opt/data/kvm/images/hello_kvm.img
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 1.1G
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: true

# qemu-img create -f qcow2 ubuntu.img 20G

# qemu-img resize /opt/data/kvm/images/hello_kvm.img  +5G
Image resized.
# qemu-img  info /opt/data/kvm/images/hello_kvm.img
image: /opt/data/kvm/images/hello_kvm.img
file format: qcow2
virtual size: 15G (16106127360 bytes)
disk size: 1.1G
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: true

# virsh destroy hello_kvm
# virsh start   hello_kvm
# virsh console hello_kvm

# 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: 16.1 GB, 16106127360 bytes, 31457280 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: 0x000dd1eb

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     1026047      512000   83  Linux
/dev/vda2         1026048    20971519     9972736   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 (20971520-31457279, default 20971520):
Using default value 20971520
Last sector, +sectors or +size{K,M,G} (20971520-31457279, default 31457279):
Using default value 31457279
Partition 3 of type Linux and of size 5 GiB is set

Command (m for help): p   

Disk /dev/vda: 16.1 GB, 16106127360 bytes, 31457280 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: 0x000dd1eb

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     1026047      512000   83  Linux
/dev/vda2         1026048    20971519     9972736   8e  Linux LVM
/dev/vda3        20971520    31457279     5242880   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.

partprobe

# df -Th --total
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs       8.5G  788M  7.7G  10% /
devtmpfs                devtmpfs  236M     0  236M   0% /dev
tmpfs                   tmpfs     245M     0  245M   0% /dev/shm
tmpfs                   tmpfs     245M  4.4M  241M   2% /run
tmpfs                   tmpfs     245M     0  245M   0% /sys/fs/cgroup
/dev/vda1               xfs       497M  120M  378M  25% /boot
total                   -         9.9G  912M  9.1G   9% -

# pvcreate /dev/vda3
  Physical volume "/dev/vda3" successfully created

# vgs
  VG     #PV #LV #SN Attr   VSize VFree
  centos   1   2   0 wz--n- 9.51g 40.00m

# vgextend centos /dev/vda3
  Volume group "centos" successfully extended

# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  centos   2   2   0 wz--n- 14.50g 5.04g

# lvextend -L +2G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 8.47 GiB (2168 extents) to 10.47 GiB (2680 extents).
  Logical volume root successfully resized


XFS
# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=555008 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=2220032, 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 2220032 to 2744320

EXT
resize2fs /dev/mapper/centos-root

# mkdir /opt/data/kvm/disk
# qemu-img create -f qcow2 /opt/data/kvm/disk/hello_kvm.qcow2 5G

# virsh destroy hello_kvm
# virsh edit hello_kvm

    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/opt/data/kvm/disk/hello_kvm.qcow2'/>
      <target dev='vdb' bus='virtio'/>
    </disk>


# virsh start hello_kvm
[root@hello-kvm ~]# fdisk -l /dev/vdb

Disk /dev/vdb: 5368 MB, 5368709120 bytes, 10485760 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


# mkfs [-t <type>] /dev/vdb
# vim /etc/fstab
# mount -a