linux调整分区大小

 

查看一下当前分区情况

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[root@localhost ~]# df -h Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root                        50G  747M   46G   2% / tmpfs                 7.8G     0  7.8G   0% /dev/shm /dev/sda1             485M   32M  429M   7% /boot /dev/mapper/VolGroup-lv_home                       163G  188M  155G   1% /home

 

我需要把VolGroup-lv_home下面的容量挪120G到VolGroup-lv_root中，

步骤如下：

1.先缩小VolGroup-lv_home,缩小是需要先umount的，扩大则不需要。

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[root@localhost ~]# umount /home [root@localhost ~]# df -h Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root                        50G  747M   46G   2% / tmpfs                 7.8G     0  7.8G   0% /dev/shm /dev/sda1             485M   32M  429M   7% /boot

 

2.使用resize2fs命令调整文件系统大小：

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[root@localhost ~]# resize2fs /dev/mapper/VolGroup-lv_home 20G resize2fs 1.41.12 (17-May-2010) Please run 'e2fsck -f /dev/mapper/VolGroup-lv_home' first.

 

执行resize2fs调整VolGroup-lv_home为20G，提示需要先执行e2fsck -f /dev/mapper/VolGroup-lv_home检查分区，那就执行吧。

 

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[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home e2fsck 1.41.12 (17-May-2010) 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/VolGroup-lv_home: 11/10829824 files (0.0% non-contiguous), 727657/43313152 blocks

 

检查完成后重新执行resize2fs命令

 

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[root@localhost ~]# resize2fs /dev/mapper/VolGroup-lv_home 20G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.

 

3.调整LVM分区大小

 

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[root@localhost ~]# lvresize -L 20G /dev/mapper/VolGroup-lv_home   WARNING: Reducing active logical volume to 20.00 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 20.00 GiB   Logical volume lv_home successfully resized

 

执行成功， 重新mount /home

 

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[root@localhost ~]# df -h Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root                        50G  747M   46G   2% / tmpfs                 7.8G     0  7.8G   0% /dev/shm /dev/sda1             485M   32M  429M   7% /boot /dev/mapper/VolGroup-lv_home                        20G  172M   19G   1% /home

  

可以看到VolGroup-lv_home已经变成20G了

 

4.把VolGroup-lv_root调大，由于VolGroup-lv_home从163G变成了20G，所以可以使用的大小为143G

先调整Lvm大小

 

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[root@localhost ~]# lvresize -L +143G /dev/mapper/VolGroup-lv_root   Extending logical volume lv_root to 193.00 GiB   Logical volume lv_root successfully resized

 

再调整文件系统大小

 

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[root@localhost ~]# resize2fs /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 = 13 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 50593792 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 50593792 blocks long.

 

5.最后查看分区情况，可以看到已经调整成功了

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[root@localhost ~]# df -h Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root                       190G  754M  180G   1% / tmpfs                 7.8G     0  7.8G   0% /dev/shm /dev/sda1             485M   32M  429M   7% /boot /dev/mapper/VolGroup-lv_home                        20G  172M   19G   1% /home