linux 逻辑卷管理 调整分区大小

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

查看复制打印?

# 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

查看复制打印?

[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  

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  

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