linux 逻辑卷管理 调整分区大小例子

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 

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