查看磁盘情况

fdisk -l /dev/sda

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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: 0x00063fa6

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048    20971519     9972736   8e  Linux LVM
/dev/sda3        20971520    41943039    10485760   8e  Linux LVM

现在,磁盘大小为 21.5 GB。磁盘占用情况为:

df -h

Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   19G  8.1G   11G  44% /
devtmpfs                 482M     0  482M   0% /dev
tmpfs                    497M   88K  497M   1% /dev/shm
tmpfs                    497M  7.0M  490M   2% /run
tmpfs                    497M     0  497M   0% /sys/fs/cgroup
/dev/sda1                497M  157M  341M  32% /boot
Share                    103G   36G   67G  35% /media/sf_Share
tmpfs                    100M  4.0K  100M   1% /run/user/42
tmpfs                    100M   12K  100M   1% /run/user/0

下面调整虚拟机操作系统的文件系统,使之识别新增的空间
1.创建新的分区

# fdisk /dev/sda

n {new partition}

p {primary partition}

3 {partition number}

[这时会提示修改大小,选择默认直接回车即可]

t {change partition id}

3 {partition number}

8e {Linux LVM partition}

如果中间有设置大小之类的提示,就直接回车。

PS:经实际测试,无此提示,但还是要重启系统,看看是否已识别该磁盘空间。

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)

就重启一下系统。

2.查看新增加的sda3是否标记为LVM,如果没有需要reboot
PS:经实际测试,sda3已经是LVM了,但系统还是不识别该磁盘空间。
3.调整LVM大小

查看Volume Group名称

vgdisplay

  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2

4.为新分配的空间创建一个新的物理卷

pvcreate /dev/sda3

5.使用新的物理卷来扩展 LVM 的 VolGroup

vgextend centos /dev/sda3

  No physical volume label read from /dev/sda3
  Writing physical volume data to disk "/dev/sda3"
  Physical volume "/dev/sda3" successfully created
  Volume group "vg_aimin" successfully extended

6.扩展 LVM 的逻辑卷 centos-root
先查看逻辑卷:

lvdisplay

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos

lvextend /dev/centos/root /dev/sda3

7.调整逻辑卷的大小

xfs_growfs /dev/centos/root

PS:不知道是调整还是同步,经实际测试需要用xfs_growfs命令,而非resize2fs命令

8.查看结果

lvscan

ACTIVE '/dev/centos/root' [18.46 GiB] inherit
ACTIVE '/dev/centos/swap' [1.00 GiB] inherit