linux系统lvm中lv使用空间的调整

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　一、系统环境：
操作系统：Centos_x64 6.5
内核版本：2.6.32-431.el6.X86_64
磁盘格式：EXT4

二、现有分区情况与说明

df -h    #查看当前分区
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   50G   17G   31G  36% /
tmpfs                         7.8G     0  7.8G   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home  435G  9.7G  404G   3% /home

　　说明：可以清楚的看到两个lv卷的分区VolGroup-lv_root挂载为了根分区50G，VolGroup-lv_home挂载为了/home分区，home分区比较大，却没有被使用。

三、释放/home分区的占用并卸载/home分区
1、以为使用fuser -m /home就可以完成但是执行后卸载仍提示/home有占用。情况如下：

# fuser -m /home
/home:               24033ce

# umount /home
umount: /home: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

2、检查占用的文件，发现甲方提供的系统里有金山的防护软件，将软件进程杀掉后卸载/home分区正常：

# lsof | grep /home          --检查发现占用的是金山的防护软件直接运行了kiil -9 24033
KANLinuxC 24033          root  cwd       DIR              253,2      4096    5636103 /home/kingsoft/kavnet
KANLinuxC 24033          root  txt       REG              253,2   1645332    5636130 /home/kingsoft/kavnet/KANMainModule
KANLinuxC 24033          root  mem       REG              253,2   1369600    5636263 /home/kingsoft/kavnet/libcrypto.so.6
KANLinuxC 24033          root  mem       REG              253,2    323320    5636276 /home/kingsoft/kavnet/libssl.so.6
KANLinuxC 24033          root  mem       REG              253,2     34487    5636129 /home/kingsoft/kavnet/KANLocalComm.so
KANLinuxC 24033          root  mem       REG              253,2    626402    5636131 /home/kingsoft/kavnet/KANNetComm.so
KANLinuxC 24033          root  mem       REG              253,2    163342    5636265 /home/kingsoft/kavnet/libjson.so
KANLinuxC 24033          root    3w      REG              253,2    789537    5636280 /home/kingsoft/kavnet/neterror.log
KANLinuxC 24033          root   10w      REG              253,2    789537    5636280 /home/kingsoft/kavnet/neterror.log
KANLinuxC 24033          root   11w      REG              253,2    789537    5636280 /home/kingsoft/kavnet/neterror.log
KANLinuxC 24033          root   13w      REG              253,2    789537    5636280 /home/kingsoft/kavnet/neterror.log
KANLinuxC 24033          root   20w      REG              253,2    789537    5636280 /home/kingsoft/kavnet/neterror.log

# umount /home          --重新卸载未在报错
未在报错。

三、缩减VolGroup-lv_home这个LV的空间
1、检查这个LV分区的信息是否正常；

# 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: 5779/28950528 files (2.2% non-contiguous), 4334183/115775488 blocks

2、调整VolGroup-lv_home分区大小；

#resize2fs -p /dev/mapper/VolGroup-lv_home 80G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 20971520 (4k) blocks.
Begin pass 2 (max = 50904)
正在重定位块            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 3534)
正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 4 (max = 838)
正在更新inode引用       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/VolGroup-lv_home is now 20971520 blocks long.

3、重新挂载home分区并检查空间大小，可以发现/home的空间已经变小；

# mount /home
# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   50G   17G   31G  36% /
tmpfs                         7.8G     0  7.8G   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home   79G  9.6G   66G  13% /home

4、将VolGroup-lv_home缩减出来的分区设置为空闲分区；

# lvreduce -L 80G /dev/mapper/VolGroup-lv_home
  WARNING: Reducing active and open logical volume to 80.00 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 80.00 GiB
  Logical volume lv_home successfully resized

5、检查空闲出的空间Free PE已经空出了361G；

# 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               499.51 GiB
  PE Size               4.00 MiB
  Total PE              127874
  Alloc PE / Size       35292 / 137.86 GiB
  Free  PE / Size       92582 / 361.65 GiB
  VG UUID               Ur7bJ4-hQKi-xx4R-f9Qt-INvG-fjBf-zcvJ4n

四、将缩减出的空间增加给VolGroup-lv_root这个LV
1、给VolGroup-lv_root增加空间；

# lvresize --size +361G /dev/VolGroup/lv_root 
  Extending logical volume lv_root to 410.71 GiB
  Logical volume lv_root successfully resized

2、让系统重新识别VolGroup-lv_root增加的空间；

# 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 = 26
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 107665408 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 107665408 blocks long.

3、检查最终结果，确认操作成功；

# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  405G   23G  362G   6% /
tmpfs                         7.8G     0  7.8G   0% /dev/shm
/dev/sda1                     485M   33M  427M   8% /boot
/dev/mapper/VolGroup-lv_home   79G  3.5G   72G   5% /home

linux系统lvm中lv使用空间的调整

标签：1.4   The   sys   磁盘占满   fuse   error   cti   files   gre   

原文地址：http://blog.51cto.com/rongshu/2313249