使用lvreduce进行容量裁剪

如果需要将一个已经挂载的分区进行容量缩小，将腾出的容量划分成其他分区，需要怎么做呢？下面为详细步骤：

1.卸载

#touch /opt/test.txt   -->写入一些文件

#umount /opt

 

2.文件系统检查

# fsck -f /dev/mapper/VolGroup00-LogVol00_opt

fsck 1.39 (29-May-2006)

e2fsck 1.39 (29-May-2006)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/dev/mapper/VolGroup00-LogVol00_opt: 41641/135479296 files (0.7% non-contiguous), 31756336/270958592 blocks

 

3.调整文件系统的大小

# resize2fs  /dev/mapper/VolGroup00-LogVol00_opt 500G       -->将VolGroup00-LogVol00_opt瘦小到500G

resize2fs 1.39 (29-May-2006)

Resizing the filesystem on /dev/mapper/VolGroup00-LogVol00_opt to 131072000 (4k) blocks.

The filesystem on /dev/mapper/VolGroup00-LogVol00_opt is now 131072000 blocks long.

 

4.裁减逻辑卷

# lvreduce -L 500G /dev/mapper/VolGroup00-LogVol00_opt

  WARNING: Reducing active logical volume to 500.00 GB

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce LogVol00_opt? [y/n]: y

  Reducing logical volume LogVol00_opt to 500.00 GB

  Logical volume LogVol00_opt successfully resized

 

5.再次检查文件系统是否出现错误

# fsck -f /dev/mapper/VolGroup00-LogVol00_opt

fsck 1.39 (29-May-2006)

e2fsck 1.39 (29-May-2006)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/dev/mapper/VolGroup00-LogVol00_opt: 41641/65536000 files (0.7% non-contiguous), 29561045/131072000 blocks

 

6.挂载

# mount -t ext3  /dev/mapper/VolGroup00-LogVol00_opt /opt

# df -h

/dev/mapper/VolGroup00-LogVol00_orabak 493G  198M  467G   1% /orabak

 

 

 

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