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标题: lvm逻辑卷管理缩小扩展分区方法 [打印本页]

作者: zhoulei 时间: 2015-12-7 20:58
标题: lvm逻辑卷管理缩小扩展分区方法
目的：由于安装系统的时候根分区分配的空间过小，／home太多与标准不符，需要修改lvm大小。
1、首先查看磁盘分区：
[root@VM_Moretv_java_01 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 50G  2.3G 45G 5% /
tmpfs                      1.9G    0  1.9G 0% /dev/shm
/dev/sda1                   485M 39M  421M 9% /boot
/dev/mapper/VolGroup-lv_home  144G  188M  136G 1% /home

2、卸载／home分区：
[root@VM_Moretv_java_01 ~]# umount /dev/mapper/VolGroup-lv_home
[root@VM_Moretv_java_01 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 50G  2.3G 45G 5% /
tmpfs                      1.9G    0  1.9G 0% /dev/shm
/dev/sda1                   485M 39M  421M 9% /boot

3、检查文件系统，确定没有坏块：
[root@VM_Moretv_java_01 ~]# e2fsck -f /dev/mapper/VolGroup-lv_home
e2fsck 1.41.12 (17-May-2010)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/mapper/VolGroup-lv_home: 17/9551872 files (0.0% non-contiguous), 647479/38176768 blocks

4、缩小文件系统到20G：
[root@VM_Moretv_java_01 ~]# resize2fs  /dev/mapper/VolGroup-lv_home 20G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.

5、缩小逻辑卷：
[root@VM_Moretv_java_01 ~]# lvreduce -L 20G /dev/mapper/VolGroup-lv_home
  WARNING: Reducing active logical volume to 20.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_home? [y/n]: y
  Reducing logical volume lv_home to 20.00 GiB
  Logical volume lv_home successfully resized

6、挂载／home分区：
[root@VM_Moretv_java_01 ~]# mount /dev/mapper/VolGroup-lv_home
[root@VM_Moretv_java_01 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 50G  2.3G 45G 5% /
tmpfs                      1.9G    0  1.9G 0% /dev/shm
/dev/sda1                   485M 39M  421M 9% /boot
/dev/mapper/VolGroup-lv_home 20G  172M 19G 1% /home

7、查看vg大小：
[root@VM_Moretv_java_01 ~]# vgdisplay
  --- Volume group ---
  VG Name             VolGroup
  System ID
  Format             lvm2
  Metadata Areas       1
  Metadata Sequence No  5
  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             199.51 GiB
  PE Size             4.00 MiB
  Total PE             51074
  Alloc PE / Size    18912 / 73.88 GiB
  Free  PE / Size    32162 / 125.63 GiB
  VG UUID             kbnkX4-Sd6E-lmu2-ygp9-lahU-jpKB-UYKo5G

可以看出来vg还有125.63G剩余空间。

8、增加根分区lv的大小：
[root@VM_Moretv_java_01 ~]# lvextend -L +125G /dev/mapper/VolGroup-lv_root
  Extending logical volume lv_root to 175.00 GiB
  Logical volume lv_root successfully resized

9、调整文件系统大小:
[root@VM_Moretv_java_01 ~]# 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 = 11
Performing an on-line resize of /dev/VolGroup/lv_root to 45875200 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 45875200 blocks long.

10、查看文件系统是否正常：
[root@VM_Moretv_java_01 ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  173G  2.3G  162G 2% /
tmpfs                      1.9G    0  1.9G 0% /dev/shm
/dev/sda1                   485M 39M  421M 9% /boot
/dev/mapper/VolGroup-lv_home 20G  172M 19G 1% /home

结果显示／分区已经扩展。

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