Linux根分区扩容

现状:

df -h
---
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_server-lv_root
                       18G  5.3G   12G  32% /
tmpfs                 499M     0  499M   0% /dev/shm
/dev/sda1             485M   33M  428M   8% /boot
---

需求
/目录增加500M

操作步骤
1.VirtualBox新加一个磁盘

image.png

2. 新建分区

fdisk /dev/sdb  
n 
p
1
一路回车
w

3.把新分区改成LVM 卷的文件系统

fdisk /dev/sdb  
t
8e
w

查看结果

[root@~]#fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x000c8aaa

   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        2611    20458496   8e  Linux LVM

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 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: 0xa7bffd53

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         130     1044193+  8e  Linux LVM

4.重启

reboot

5.格式化分区

mkfs.ext4   /dev/sdb1

6.创建PV(物理卷)

[root@~]#pvcreate /dev/sdb1
  Writing physical volume data to disk "/dev/sdb1"
  Physical volume "/dev/sdb1" successfully created

查看卷组

[root@~]#pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_server
  PV Size               19.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               0
  Allocated PE          4994
  PV UUID               HZMNR8-G8C2-J5DU-NRr3-Js14-pH9V-EkIIpm
   
  "/dev/sdb1" is a new physical volume of "1019.72 MiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name               
  PV Size               1019.72 MiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               ML9upI-cmhe-cNUQ-cHd0-vgYd-YHW2-1s0XvY

7.将新的物理卷，加载到原始卷组

[root@~]#vgextend   vg_server  /dev/sdb1
  Volume group "vg_server" successfully extended

查看卷组

[root@~]#pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_server
  PV Size               19.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               0
  Allocated PE          4994
  PV UUID               HZMNR8-G8C2-J5DU-NRr3-Js14-pH9V-EkIIpm
   
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               vg_server
  PV Size               1019.72 MiB / not usable 3.72 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              254
  Free PE               254
  Allocated PE          0
  PV UUID               ML9upI-cmhe-cNUQ-cHd0-vgYd-YHW2-1s0XvY

8.把VG中多余的空间添加到/dev/mapper/vg_server-lv_root 中

[root@~]#lvextend -L +500M /dev/mapper/vg_server-lv_root /dev/sdb1
  Extending logical volume lv_root to 18.03 GiB
  Logical volume lv_root successfully resized

大功告成