Linux下调整目录的空间大小

灰太狼 2022-08-02 02:18 320阅读 0赞

一、目的

在使用CentOS6.5版本linux系统的时候，发现根目录(/)的空间不是很充足，而其他目录空间有很大的空闲，所以本文主要是针对现在已有的空间进行调整。首先，先来查看一下系统的空间分配情况：

\[root@innoplay01 ~\]\# lsb\_release -a  
LSB Version: :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch  
Distributor ID: CentOS  
Description: CentOS release 6.5 (Final)  
Release: 6.5

Codename:Final

\[root@innoplay01 java\]\# df -h  
Filesystem                         Size  Used Avail Use% Mounted on  
/dev/mapper/vg\_innoplay01-lv\_root   50G  2.0G   45G   5% /  
tmpfs                              3.9G     0  3.9G   0% /dev/shm  
/dev/sda1                          485M   40M  421M   9% /boot  
/dev/mapper/vg\_innoplay01-lv\_home  860G  200M  816G   1% /home

下面的详细步骤部分将从/dev/mapper/vg\_innoplay01-lv\_home 分区下取出661G的空间添加到/dev/mapper/vg\_innoplay01-lv\_root 分区上去。

卸载/dev/mapper/vg\_innoplay01-lv\_home分区:  
  
  
\[root@innoplay01 java\]\# umount /home  
  
  
此时在用df命令查看将会发现/home目录已经看不见了，如下所示：  
  
  
\[root@innoplay01 java\]\# df -h  
Filesystem                         Size  Used Avail Use% Mounted on  
/dev/mapper/vg\_innoplay01-lv\_root   50G  2.0G   45G   5% /  
tmpfs                              3.9G     0  3.9G   0% /dev/shm  
/dev/sda1                          485M   40M  421M   9% /boot  
  
![Center][]  
  
从新设定/dev/mapper/vg\_innoplay01-lv\_home的大小:  
  
  
resize2fs -p /dev/mapper/vg\_innoplay01-lv\_home 210G  
  
\[root@innoplay01 java\]\#  resize2fs -p /dev/mapper/vg\_innoplay01-lv\_home 210G  
resize2fs 1.41.12 (17-May-2010)  
Please run 'e2fsck -f /dev/mapper/vg\_innoplay01-lv\_home' first.  
  
依照提示执行：  
  
e2fsck -f /dev/mapper/vg\_innoplay01-lv\_home  
  
\[root@innoplay01 java\]\# e2fsck -f /dev/mapper/vg\_innoplay01-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/vg\_innoplay01-lv\_home: 11/57237504 files (0.0% non-contiguous), 3643567/228918272 blocks  
\[root@innoplay01 java\]\# resize2fs -p /dev/mapper/vg\_innoplay01-lv\_home 210G  
resize2fs 1.41.12 (17-May-2010)  
Resizing the filesystem on /dev/mapper/vg\_innoplay01-lv\_home to 55050240 (4k) blocks.  
Begin pass 2 (max = 32768)  
Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  
Begin pass 3 (max = 6987)  
Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  
The filesystem on /dev/mapper/vg\_innoplay01-lv\_home is now 55050240 blocks long.  
  
  
  
![Center 1][]  
  
  
检查是否成功：  
  
  
\[root@innoplay01 java\]\# mount /home  
\[root@innoplay01 java\]\# df -h  
Filesystem                         Size  Used Avail Use% Mounted on  
/dev/mapper/vg\_innoplay01-lv\_root   50G  2.0G   45G   5% /  
tmpfs                              3.9G     0  3.9G   0% /dev/shm  
/dev/sda1                          485M   40M  421M   9% /boot  
/dev/mapper/vg\_innoplay01-lv\_home  207G  188M  197G   1% /home  
  
将/dev/mapper/vg\_innoplay01-lv\_home逻辑分区减小到指定大小：  
  
lvreduce -L 210G /dev/mapper/vg\_innoplay01-lv\_home  
  
\[root@innoplay01 java\]\# lvreduce -L 210G /dev/mapper/vg\_innoplay01-lv\_home  
  WARNING: Reducing active and open logical volume to 210.00 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 210.00 GiB  
  Logical volume lv\_home successfully resized  
  
  查询卷组的信息：  
  vgdisplay    
  
  \[root@innoplay01 java\]\# vgdisplay  
  --- Volume group ---  
  VG Name               vg\_innoplay01  
  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               931.02 GiB  
  PE Size               4.00 MiB  
  Total PE              238341  
  Alloc PE / Size       68548 / 267.77 GiB  
  Free  PE / Size       169793 / 663.25 GiB  
  VG UUID               SyMjnp-iGwM-MkT1-UBUM-rSx8-hviz-EzTUEr  
  
  Free PE / Size指定的应该是现在可在分配的空间。  
  
  增加/dev/mapper/vg\_innoplay01-lv\_root分区的大小:  
  
  lvextend -L +661.00G /dev/mapper/vg\_innoplay01-lv\_root  
  
  \[root@innoplay01 java\]\#  lvextend -L +661.00G /dev/mapper/vg\_innoplay01-lv\_root  
  Extending logical volume lv\_root to 711.00 GiB  
  Logical volume lv\_root successfully resized  
  
  
  从新设定该分区的大小：  
  resize2fs -p /dev/mapper/vg\_innoplay01-lv\_root  
  
  \[root@innoplay01 java\]\# resize2fs -p /dev/mapper/vg\_innoplay01-lv\_root  
resize2fs 1.41.12 (17-May-2010)  
Filesystem at /dev/mapper/vg\_innoplay01-lv\_root is mounted on /; on-line resizing required  
old desc\_blocks = 18, new\_desc\_blocks = 45  
Performing an on-line resize of /dev/mapper/vg\_innoplay01-lv\_root to 186384384 (4k) blocks.  
The filesystem on /dev/mapper/vg\_innoplay01-lv\_root is now 186384384 blocks long.  
  
  
再次查看分区大小:  
\[root@innoplay01 java\]\# df -h  
Filesystem                         Size  Used Avail Use% Mounted on  
/dev/mapper/vg\_innoplay01-lv\_root  700G  2.0G  663G   1% /  
tmpfs                              3.9G     0  3.9G   0% /dev/shm  
/dev/sda1                          485M   40M  421M   9% /boot  
/dev/mapper/vg\_innoplay01-lv\_home  207G  188M  197G   1% /home

注意点：

1、在卸载/home目录的时候失败，可先执行如下fuser命令，然后再umount即可：fuser -m /home ；

2、设定完lv\_home的大小，再次mount该分区时，发现用df命令无法看到给分区，此时只要在mount一次即可；

3、在设定lv\_root的大小时，不要把Free PE / Size的空间全部都用上，这很可能会出现Free PE空间不足的现象，建议保留一点Free PE的空间。

[Center]: /images/20220731/ca1a2817118c435ba93dc1626913a2fb.png
[Center 1]: /images/20220731/000a91f2193541d99dd11efe052bdc4d.png