#查看磁盘

 fdisk -l

 #创建pv

 pvcreate /dev/sdb

 [root@VM-67-49 ~]# pvcreate /dev/sdb

   Physical volume "/dev/sdb" successfully created.

 [root@VM-67-49 ~]# pvdisplay

   --- Physical volume ---

   PV Name               /dev/sda2

   VG Name               centos

   PV Size               29.51 GiB / not usable 3.00 MiB

   Allocatable           yes

   PE Size               4.00 MiB

   Total PE              7554

   Free PE               10

   Allocated PE          7544

   PV UUID               jfRAJl-pnUs-8lXi-1F37-IX3t-Nq8S-RdtQvq

   "/dev/sdb" is a new physical volume of "100.00 GiB"

   --- NEW Physical volume ---

   PV Name               /dev/sdb

   VG Name

   PV Size               100.00 GiB

   Allocatable           NO

   PE Size               0

   Total PE              0

   Free PE               0

   Allocated PE          0

   PV UUID               ggiAwS-NizD-1liX-7b5i-fqpR-ZKL8-t8aZqD

 #查看VG

 [root@VM-67-49 ~]# vgdisplay

   --- Volume group ---

   VG Name               centos

   System ID

   Format                lvm2

   Metadata Areas        2

   Metadata Sequence No  6

   VG Access             read/write

   VG Status             resizable

   MAX LV                0

   Cur LV                2

   Open LV               2

   Max PV                0

   Cur PV                2

   Act PV                2

   VG Size               129.50 GiB

   PE Size               4.00 MiB

   Total PE              33153

   Alloc PE / Size       33153 / 129.50 GiB

   Free  PE / Size       0 / 0

   VG UUID               Y9ksOO-scOb-2VAn-bGUB-vX9U-oVee-mPt59q

 [root@VM-66-82 ~]# vgextend centos /dev/sdb

   Volume group "centos" successfully extended

 [root@VM-66-82 ~]# lvextend -l +100%FREE /dev/mapper/centos-root

   Size of logical volume centos/root changed from 26.51 GiB (6786 extents) to 126.50 GiB (32385 extents).

   Logical volume centos/root successfully resized.

 #创建vg

 lvextend -l +100%FREE /dev/mapper/centos-root

 #查看文件系统

 [root@VM-67-49 ~]# df -T

 Filesystem              Type     1K-blocks    Used Available Use% Mounted on

 /dev/mapper/centos-root xfs       27740944 9828872  17912072  36% /

 devtmpfs                devtmpfs   3994572       0   3994572   0% /dev

 tmpfs                   tmpfs      4005240       0   4005240   0% /dev/shm

 tmpfs                   tmpfs      4005240  403684   3601556  11% /run

 tmpfs                   tmpfs      4005240       0   4005240   0% /sys/fs/cgroup

 /dev/sda1               xfs         508588  191684    316904  38% /boot

 #是添加的磁盘生效

 [root@VM-67-49 ~]# xfs_growfs /dev/mapper/centos-root

 meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=1734656 blks

          =                       sectsz=512   attr=2, projid32bit=1

          =                       crc=0        finobt=0 spinodes=0

 data     =                       bsize=4096   blocks=6938624, imaxpct=25

          =                       sunit=0      swidth=0 blks

 naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

 log      =internal               bsize=4096   blocks=3388, version=2

          =                       sectsz=512   sunit=0 blks, lazy-count=1

 realtime =none                   extsz=4096   blocks=0, rtextents=0

 data blocks changed from 6938624 to 33162240

 #验证

 Filesystem               Size  Used Avail Use% Mounted on

 /dev/mapper/centos-root  127G  9.4G  118G   8% /

 devtmpfs                 3.9G     0  3.9G   0% /dev

 tmpfs                    3.9G     0  3.9G   0% /dev/shm

 tmpfs                    3.9G  395M  3.5G  11% /run

 tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup

 /dev/sda1                497M  188M  310M  38% /boot