CentOS7.5磁盘空间转移 - 此方法存在bug，系统重启后无法正常进入系统！！！

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原创最新推荐文章于 2026-07-21 14:10:57 发布 1.7k 阅读 AI 写同款· GEO 优化 ›

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此方法存在bug，系统重启后无法正常进入系统！！！

前阵儿虚拟机默认装系统后，磁盘空间分配不均，就想上网找帖子把这个问题解决了，找到了好多一模一样的帖子，真是福气，就算转载，你先自己验证一下能否操作再转，不。。。转载的帖子各种错误，各种坑，也不知道没脑子转载的那些人是怎么想的！

我也是小白，我也得从网上找解决办法，就找了好几篇文章，然后到自己的虚拟机里测试，当时测试是挺好的，后来就遇到虚拟机重启后无法进入系统的问题，当时都没有往这里想；

一直不知道是哪里的错误，后来才发现问题的根源在这里！

所以在这里记录一下，等后续有时间了再研究怎么解决这个问题！

我目前的解决方案是，在安装虚拟机装系统时，自行分区，不使用默认分区即可！

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以下是原贴：

安装虚拟机时，磁盘200G，未手动分配磁盘空间，默认安装后发现/home容量过大，而/root容量太小，现在把/home容量转移到/root下；

1、显示磁盘挂载信息

从下图可以看到，/root容量为53.7G，而/home容量为153.7G，下面转移130G容量；

[root@server1 ~]# fdisk -l

Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000023f5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   419430399   208665600   8e  Linux LVM

Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-swap: 6308 MB, 6308233216 bytes, 12320768 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-home: 153.7 GB, 153670909952 bytes, 300138496 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

[root@server1 ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   50G   26G   25G  51% /
devtmpfs                 2.9G     0  2.9G   0% /dev
tmpfs                    2.9G   12K  2.9G   1% /dev/shm
tmpfs                    2.9G  121M  2.8G   5% /run
tmpfs                    2.9G     0  2.9G   0% /sys/fs/cgroup
/dev/mapper/centos-home  144G   37M  144G   1% /home
/dev/sda1               1014M  170M  845M  17% /boot
tmpfs                    579M   12K  579M   1% /run/user/42
tmpfs                    579M     0  579M   0% /run/user/0

2、减少/centos-home磁盘130G容量

[root@server1 ~]# lvreduce -L -130G /dev/mapper/centos-home
  WARNING: Reducing active and open logical volume to <13.12 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce centos/home? [y/n]: y
  Size of logical volume centos/home changed from <143.12 GiB (36638 extents) to <13.12 GiB (3358 extents).
  Logical volume centos/home successfully resized.

3、增加/centos-root磁盘130G容量

[root@server1 ~]# lvextend -L +130G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 180.00 GiB (46080 extents).
  Logical volume centos/root successfully resized.

4、刷新磁盘

[root@server1 ~]# xfs_growfs /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=512    agcount=4, agsize=9379328 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=37517312, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=18319, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data size 3438592 too small, old size is 37517312
[root@server1 ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 47185920

5、显示磁盘挂载信息

可以看到，/centos-root容量增加到193.3G，/centos-home容量减少到14.1G；

[root@server1 ~]# fdisk -l

Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000023f5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   419430399   208665600   8e  Linux LVM

Disk /dev/mapper/centos-root: 193.3 GB, 193273528320 bytes, 377487360 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-swap: 6308 MB, 6308233216 bytes, 12320768 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-home: 14.1 GB, 14084472832 bytes, 27508736 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

[root@server1 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  180G   26G  155G  15% /
devtmpfs                 2.9G     0  2.9G   0% /dev
tmpfs                    2.9G   12K  2.9G   1% /dev/shm
tmpfs                    2.9G  121M  2.8G   5% /run
tmpfs                    2.9G     0  2.9G   0% /sys/fs/cgroup
/dev/mapper/centos-home  144G   37M  144G   1% /home
/dev/sda1               1014M  170M  845M  17% /boot
tmpfs                    579M   12K  579M   1% /run/user/42
tmpfs                    579M     0  579M   0% /run/user/0

完结撒花~~~

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