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linux 逻辑卷管理 调整分区大小例子

  文章就是一个关于linux 逻辑卷管理 调整分区大小例子,我们只要按下面代码操作就完成100%完成逻辑卷管理 调整分区大小了.

  测试机各种报错,创建个目录都报错,df看了一下,发现VolGroup-lv_root 100%,虚拟磁盘满了,怎么办呢

  1,解决过程

  # df -h //查看分区

  # umount /home //取消挂载

  # e2fsck -f /dev/mapper/VolGroup-lv_home //分区检测

  # resize2fs -p /dev/mapper/VolGroup-lv_home 100G //将lv_home虚拟分区设为100G

  # mount /home //挂载home

  # df -h //查看分区

  # lvreduce -L 100G /dev/mapper/VolGroup-lv_home //释放空间

  # vgdisplay //查看可用空间大小

  # lvextend -L +311.47G /dev/mapper/VolGroup-lv_root //扩展lv_root虚拟分区

  # resize2fs -p /dev/mapper/VolGroup-lv_root //lv_root重设分区大小

  LVM(逻辑磁盘管理),灵活性很高.

  2,详细解决过程

  [root@localhost ~]# df -h

  Filesystem Size Used Avail Use% Mounted on

  /dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /   //lv_root满了

  tmpfs 1.9G 72K 1.9G 1% /dev/shm

  /dev/sda1 485M 40M 420M 9% /boot

  /dev/mapper/VolGroup-lv_home 406G 19G 366G 5% /home   //lv_home空间很多

  [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G

  resize2fs 1.41.12 (17-May-2010)

  Filesystem at /dev/mapper/VolGroup-lv_home is mounted on /home; on-line resizing required

  On-line shrinking from 107865088 to 65536000 not supported.    //先umount才能resize2fs

  [root@localhost ~]# umount /home   //umount home目录

  [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G

  resize2fs 1.41.12 (17-May-2010)

  请先运行 'e2fsck -f /dev/mapper/VolGroup-lv_home'.   //提示要先进行磁盘检测

  [root@localhost ~]# 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

[Ok3w_NextPage]

  第5步: 检查簇概要信息

  /dev/mapper/VolGroup-lv_home: 1459/16384000 files (4.0% non-contiguous), 5914204/65536000 blocks

  [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 100G    //重定大小

  resize2fs 1.41.12 (17-May-2010)

  Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 26214400 (4k) blocks.

  Begin pass 2 (max = 32768)

  正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  Begin pass 3 (max = 2000)

  正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  The filesystem on /dev/mapper/VolGroup-lv_home is now 26214400 blocks long.

  [root@localhost ~]# mount /home/

  [root@localhost ~]# df -h

  Filesystem Size Used Avail Use% Mounted on

  /dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /

  tmpfs 1.9G 72K 1.9G 1% /dev/shm

  /dev/sda1 485M 40M 420M 9% /boot

  /dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home

  [root@localhost ~]# lvreduce -L 100G /dev/mapper/VolGroup-lv_home   //释放空间

  WARNING: Reducing active and open logical volume to 100.00 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 100.00 GiB

  Logical volume lv_home successfully resized

  [root@localhost ~]# df -h

  Filesystem Size Used Avail Use% Mounted on

  /dev/mapper/VolGroup-lv_root 50G 47G 16M 100% /

  tmpfs 1.9G 72K 1.9G 1% /dev/shm

  /dev/sda1 485M 40M 420M 9% /boot

  /dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home

  [root@localhost ~]# vgdisplay

  --- Volume group ---

  VG Name VolGroup

  System ID

  Format lvm2

  Metadata Areas 1

  Metadata Sequence No 5

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  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 465.27 GiB

  PE Size 4.00 MiB

  Total PE 119109

  Alloc PE / Size 39372 / 153.80 GiB

  Free PE / Size 79737 / 311.47 GiB       //空闲空间

  VG UUID Vt2V4t-Byxs-tQqk-cY0h-IDE3-pabX-LUfkRS

  [root@localhost ~]# lvextend -L +311.47G /dev/mapper/VolGroup-lv_root   //空闲空间加入到lv_root

  Rounding size to boundary between physical extents: 311.47 GiB

  Extending logical volume lv_root to 361.47 GiB

  Logical volume lv_root successfully resized

  [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_root

  resize2fs 1.41.12 (17-May-2010)

  Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required

  old desc_blocks = 4, new_desc_blocks = 23    //这儿要耐心等待,扩大越多,时间越长

  Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 94757888 (4k) blocks.

  The filesystem on /dev/mapper/VolGroup-lv_root is now 94757888 blocks long.

  [root@localhost openfire]# df -h

  Filesystem Size Used Avail Use% Mounted on

  /dev/mapper/VolGroup-lv_root 356G 48G 308G 14% /

  tmpfs 1.9G 72K 1.9G 1% /dev/shm

  /dev/sda1 485M 40M 420M 9% /boot

  /dev/mapper/VolGroup-lv_home 99G 19G 75G 20% /home

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