虚拟机LVM扩容根分区

1、虚拟机关机给硬盘增加20G

2、查看现有分区大小

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       50G   44G  3.1G  94% /
tmpfs                 931M   92K  931M   1% /dev/shm
/dev/sda1             477M   69M  383M  16% /boot
/dev/mapper/VolGroup-lv_home
                       43G  286M   41G   1% /home

目前根目录总共53G,使用了47G

3、查看磁盘结构

[root@localhost ~]# lsblk
NAME                        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda                           8:0    0  120G  0 disk
├─sda1                        8:1    0  500M  0 part /boot
└─sda2                        8:2    0 99.5G  0 part
  ├─VolGroup-lv_root (dm-0) 253:0    0   50G  0 lvm  /
  ├─VolGroup-lv_swap (dm-1) 253:1    0  5.8G  0 lvm  [SWAP]
  └─VolGroup-lv_home (dm-2) 253:2    0 43.7G  0 lvm  /home
sr0                          11:0    1 1024M  0 rom

磁盘大小120G,有20G空余

4、创建新分区

[root@localhost ~]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (13055-15665, default 13055): 
Using default value 13055
Last cylinder, +cylinders or +size{K,M,G} (13055-15665, default 15665): 
Using default value 15665

Command (m for help): p

Disk /dev/sda: 128.8 GB, 128849018880 bytes
255 heads, 63 sectors/track, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006372f

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64       13055   104344576   8e  Linux LVM
/dev/sda3           13055       15665    20971512+  83  Linux

Command (m for help):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)
Syncing disks.

5、刷新分区

[root@localhost ~]# partprobe /dev/sda
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (设备或资源忙).  As a result, it may not reflect all of your changes until after reboot.

报错，重启设备

6、创建物理卷

[root@localhost ~]# pvcreate /dev/sda3
  Physical volume "/dev/sda3" successfully created

7、查看卷组名称及使用情况

[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               99.51 GiB
  PE Size               4.00 MiB
  Total PE              25474
  Alloc PE / Size       25474 / 99.51 GiB
  Free  PE / Size       0 / 0
  VG UUID               Cvtddv-VzMi-wGeE-ZoDX-door-HsPt-CV83A0

8、将物理卷扩展到卷组

[root@localhost ~]# vgextend  VolGroup /dev/sda3
  Volume group "VolGroup" successfully extended

9、查看逻辑卷名称及使用情况

[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_root
  LV Name                lv_root
  VG Name                VolGroup
  LV UUID                8cr93l-olWM-cl76-ei2q-uw89-RtUR-IZi2zY
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2019-11-01 04:32:57 +0800
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_home
  LV Name                lv_home
  VG Name                VolGroup
  LV UUID                lTSehz-ENYB-3Wwd-Bebw-e19v-ria5-NzjDID
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2019-11-01 04:33:04 +0800
  LV Status              available
  # open                 1
  LV Size                43.68 GiB
  Current LE             11182
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_swap
  LV Name                lv_swap
  VG Name                VolGroup
  LV UUID                dvJ5oq-kOqg-9PgR-gVSh-v8rw-6tti-fkwMpn
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2019-11-01 04:33:06 +0800
  LV Status              available
  # open                 1
  LV Size                5.83 GiB
  Current LE             1492
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

10、将卷组中的空闲空间扩展到根分区逻辑卷

[root@localhost ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root
  Size of logical volume VolGroup/lv_root changed from 50.00 GiB (12800 extents) to 70.00 GiB (17919 extents).
  Logical volume lv_root successfully resized.

11、刷新根分区

[root@localhost ~]# resize2fs  /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 4, new_desc_blocks = 5
Performing an on-line resize of /dev/VolGroup/lv_root to 18349056 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 18349056 blocks long.

12、查看磁盘使用情况

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       69G   44G   22G  67% /
tmpfs                 931M   16K  931M   1% /dev/shm
/dev/sda1             477M   69M  383M  16% /boot
/dev/mapper/VolGroup-lv_home
                       43G  287M   41G   1% /home