查看磁盘挂载情况

 fdisk -l 

添加磁盘分区

fdisk /dev/sda 输入n创建一个新分区 Command (m for help): n

p   

编号默认回车

起始和结束标号默认回车

输入p再次查看已分区信息

输入t更改分区类型（改为和sda2一样的类型将来合并） Command (m for help): t

然后再输入8e表示是lvm格式

Partition number (1-3, default 3): 3 Hex code (type L to list all codes): 8e

Changed type of partition 'Linux' to 'Linux LVM'. 输入p再次查看已分区信息 Device     Boot    Start      End  Sectors Size Id Type
/dev/sda1  * 2048 2099199 2097152 1G 83 Linux
/dev/sda2 2099200 62914559 60815360 29G 8e Linux LVM
/dev/sda3 62914560 83886079 20971520 10G 8e Linux LVM 输入w保存并退出

.重启虚拟机reboot

扩容磁盘

pvdisplay

回显：

 --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               <29.00 GiB / not usable 3.00 MiB
  Allocatable           yes (but full) PE Size               4.00 MiB
  Total PE 7423 Free PE 0 Allocated PE 7423 PV UUID               eMFIcc-TfvQ-yXpB-14pu-zJ1x-IAlr-WEBvlT 

创建新物理卷信息 

pvcreate /dev/sda3 

Physical volume "/dev/sda3" successfully created. 

再查看物理卷信息

 pvdisplay

 --- Physical volume ---

  PV Name               /dev/sda2
  VG Name               cl
  PV Size               <29.00 GiB / not usable 3.00 MiB
  Allocatable           yes (but full) PE Size               4.00 MiB
  Total PE 7423 Free PE 0 Allocated PE 7423 PV UUID               eMFIcc-TfvQ-yXpB-14pu-zJ1x-IAlr-WEBvlT "/dev/sda3" is a new physical volume of "10.00 GiB" --- NEW Physical volume ---
  PV Name               /dev/sda3
  VG Name               
  PV Size               10.00 GiB
  Allocatable           NO
  PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID               oqPz9B-TSEF-3cQZ-bJP8-rvAo-Ud5S-hUUgwb 

将/dev/sda3添加导/dev/sda2对应的VG名centos中去 

vgextend centos /dev/sda3 

Volume group "centos" successfully extended 

再次查看物理卷信息

pvdisplay

查看磁盘信息 # 我们要扩容的磁盘是/dev/mapper/centos-root 

df -h 

扩容 

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

扩容/dev/mapper/centos-root对应的文件系统/ 

xfs_growfs / 

查看磁盘信息(扩容完毕) 

df -h