centos7 磁盘重新挂载

参考文档：centos7磁盘分区、格式化、挂载

查看磁盘挂载情况：

df -h

# 发现/home目录挂载了个800G的磁盘太大了，将其重新挂载为数据盘，使得/home和/共享一个驱动/dev/mapper/centos-root
文件系统                 容量  已用  可用 已用% 挂载点
devtmpfs                  16G     0   16G    0% /dev
tmpfs                     16G     0   16G    0% /dev/shm
tmpfs                     16G  9.1M   16G    1% /run
tmpfs                     16G     0   16G    0% /sys/fs/cgroup
/dev/mapper/centos-root  100G  2.0G   99G    2% /
/dev/nvme0n1p2          1014M  144M  871M   15% /boot
/dev/nvme0n1p1           200M   12M  189M    6% /boot/efi
/dev/mapper/centos-home  815G   33M  815G    1% /home
tmpfs                    3.2G     0  3.2G    0% /run/user/0

卸载磁盘：

umount /dev/mapper/centos-home
umount: /dev/mapper/centos-home: device is busy

# 通过以下命令看看什么进程在使用，将进程杀掉后再次卸载
/sbin/fuser -m -v /dev/mapper/centos-home

格式化磁盘：

mkfs.ext4  /dev/mapper/centos-home

mke2fs 1.42.9 (28-Dec-2013)
Discarding device blocks: 完成                            
文件系统标签=
OS type: Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
53387264 inodes, 213547008 blocks
10677350 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=2361393152
6517 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
        102400000

Allocating group tables: 完成                            
正在写入inode表: 完成                            
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成     

将驱动挂载到新的目录：

mkdir /data

mount /dev/mapper/centos-home /data

修改/etc/fstab中对应项挂载路径:

/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=1f43d46a-189e-4fc2-af5b-a8a8b9e7b269 /boot                   xfs     defaults        0 0
UUID=445E-FD75          /boot/efi               vfat    umask=0077,shortname=winnt 0 0
# 修改处
/dev/mapper/centos-home /data                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0