[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 61G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 60.5G 0 part
├─rhel-root 253:0 0 52.5G 0 lvm /
└─rhel-swap 253:1 0 8G 0 lvm [SWAP]
sdb 8:16 0 100G 0 disk
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# fdisk /dev/sdb
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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x2aebfa9e.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-209715199, default 2048):
Using default value 2048
Last sector, +sectors or +size{
K,M,G} (2048-209715199, default 209715199):
Using default value 209715199
Partition 1 of type Linux and of size 100 GiB is set
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sdb: 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: 0x2aebfa9e
Device Boot Start End Blocks Id System
/dev/sdb1 2048 209715199 104856576 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]# partprobe
[root@localhost ~]# partx /dev/sdb
NR START END SECTORS SIZE NAME UUID
1 2048 209715199 209713152 100G
[root@localhost ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.
[root@localhost ~]# vgextend rhel /dev/sdb1
Volume group "rhel" successfully extended
[root@localhost ~]# lvextend -l +100%FREE /dev/rhel/root
Size of logical volume rhel/root changed from <52.51 GiB (13442 extents) to 152.50 GiB (39041 extents).
Logical volume rhel/root successfully resized.
[root@localhost ~]# resize2fs /dev/rhel/root
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/rhel/root is mounted on /; on-line resizing required
old_desc_blocks = 7, new_desc_blocks = 20
The filesystem on /dev/rhel/root is now 39977984 blocks long.
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 61G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 60.5G 0 part
├─rhel-root 253:0 0 152.5G 0 lvm /
└─rhel-swap 253:1 0 8G 0 lvm [SWAP]
sdb 8:16 0 100G 0 disk
└─sdb1 8:17 0 100G 0 part
└─rhel-root 253:0 0 152.5G 0 lvm /
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/rhel-root ext4 162G 6.0G 148G 4% /
devtmpfs devtmpfs 26G 0 26G 0% /dev
tmpfs tmpfs 26G 0 26G 0% /dev/shm
tmpfs tmpfs 26G 29M 26G 1% /run
tmpfs tmpfs 26G 0 26G 0% /sys/fs/cgroup
/dev/sda1 xfs 521M 145M 376M 28% /boot
tmpfs tmpfs 5.1G 0 5.1G 0% /run/user/1000
命令步骤：
fdisk /dev/sdb --> n --> p --> 1 --> 回车 --> 回车 --> t --> 8e --> p --> w
partprobe #同步分区表到硬盘 或者partx /dev/sdb
pvcreate /dev/sdb1
vgextend vg名字 /dev/sdb1
lvextend -l +100%FREE /dev/rhel/root #或者全部空间加载给根目录
xfs_growfs /dev/rhel/root #xfs格式使用此命令
resize2fs /dev/rhel/root #ext2、ext3、ext4使用此命令