1.查看磁盘使用
root@tomoncle:~# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 2.0G 1.1M 2.0G 1% /run
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/mapper/centos-root 27G 21G 7.0G 75% /
/dev/sda1 1014M 185M 830M 19% /boot
tmpfs 391M 0 391M 0% /run/user/0
2.查看磁盘分区,总量107.4 GB,3个块设备
root@tomoncle:~# fdisk -l
磁盘 /dev/sda:107.4 GB, 107374182400 字节,209715200 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节
磁盘标签类型:dos
磁盘标识符:0x000b6687
设备 Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
/dev/sda3 41943040 62914559 10485760 83 Linux
磁盘 /dev/mapper/centos-root:29.0 GB, 28982640640 字节,56606720 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节
磁盘 /dev/mapper/centos-swap:2147 MB, 2147483648 字节,4194304 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节
3.查看卷组名称,以及卷组使用情况
root@tomoncle:~# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 28.99 GiB
PE Size 4.00 MiB
Total PE 7422
Alloc PE / Size 7422 / 28.99 GiB
Free PE / Size 0 / 0
VG UUID rpGD9T-QbcR-ogOf-9x5W-D7ZI-46Sp-x2pR4d
4.创建分区
root@tomoncle:~# fdisk /dev/sda
欢迎使用 fdisk (util-linux 2.23.2)。
更改将停留在内存中,直到您决定将更改写入磁盘。
使用写入命令前请三思。
命令(输入 m 获取帮助):n
Partition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p
已选择分区 4
起始 扇区 (62914560-209715199,默认为 62914560):
将使用默认值 62914560
Last 扇区, +扇区 or +size{K,M,G} (62914560-209715199,默认为 209715199):
将使用默认值 209715199
分区 4 已设置为 Linux 类型,大小设为 70 GiB
命令(输入 m 获取帮助):p
磁盘 /dev/sda:107.4 GB, 107374182400 字节,209715200 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节
磁盘标签类型:dos
磁盘标识符:0x000b6687
设备 Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
/dev/sda3 41943040 62914559 10485760 83 Linux
/dev/sda4 62914560 209715199 73400320 83 Linux
命令(输入 m 获取帮助):w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.
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)
正在同步磁盘。
5.刷新分区并创建物理卷
root@tomoncle:~# partprobe /dev/sda
root@tomoncle:~# pvcreate /dev/sda4
Physical volume "/dev/sda4" successfully created.
6.将物理卷 /dev/sda4
扩展到 卷组centos
root@tomoncle:~# vgextend centos /dev/sda4
Volume group "centos" successfully extended
7.查看当前逻辑卷的空间状态
root@tomoncle:~# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID XcSWL1-RnsO-qudm-RbKm-lydl-DCeT-hXS0iz
LV Write Access read/write
LV Creation host, time tomoncle, 2019-07-02 11:37:33 +0800
LV Status available
# open 0
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID oJqxNE-gMsu-EtXn-1GNt-1Vk3-h6KV-7Peqoh
LV Write Access read/write
LV Creation host, time tomoncle, 2019-07-02 11:37:33 +0800
LV Status available
# open 1
LV Size 26.99 GiB
Current LE 6910
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
8.将卷组中的空闲空间扩展到根分区逻辑卷 /dev/centos/root
root@tomoncle:~# lvextend -l +100%FREE /dev/centos/root
Size of logical volume centos/root changed from 26.99 GiB (6910 extents) to <96.99 GiB (24829 extents).
Logical volume centos/root successfully resized.
9.刷新根分区
root@tomoncle:~# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=7, agsize=1113856 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=7075840, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
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 7075840 to 25424896
10.查看扩容后磁盘
root@tomoncle:~# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 2.0G 1.1M 2.0G 1% /run
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/mapper/centos-root 97G 21G 77G 21% /
/dev/sda1 1014M 185M 830M 19% /boot
tmpfs 391M 0 391M 0% /run/user/0
11.测试环境验证,生产环境建议挂其他目录