对于Linux系统来说，挂载磁盘的方法其实都大同小异，所以本文以CentOS系统为例，介绍下Linux系统磁盘挂载方法，前面大部分内容源于天翼云的论坛。
1.查看磁盘情况
使用命令fdisk -l # 列出全部磁盘信息
[root@qxyw ~]# fdisk -l Disk /dev/xvda: 42.9 GB, 42949672960 bytes255 heads, 63 sectors/track, 5221 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0008a9a5Device Boot Start End Blocks Id System/dev/xvda1 1 523 4194304 82 Linux swap / Solaris Partition 1 does not end on cylinder boundary./dev/xvda2 * 523 5222 37747712 83 Linux Disk /dev/xvde: 322.1 GB, 322122547200 bytes255 heads, 63 sectors/track, 39162 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
2.创建分区
fdisk /dev/xvde # 对xvde硬盘进行分区
n # 创建一个新分区
p # 创建一个主分区（e为扩展分区）
1 # 1表示第一个主分区
回车 # 从第1柱面开始分区
回车 # 表示整个xvde全写入第1分区（若需要将sdb分为多个分区，此时输入+分区大小）
P # 查看下已创建好的分区
w # 保存并退出
[root@qxyw ~]# fdisk /dev/xvde
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x590ca8b1.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1First cylinder (1-39162, default 1):
Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-39162, default 39162):
Using default value 39162Command (m for help): p
Disk /dev/xvde: 322.1 GB, 322122547200 bytes255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x590ca8b1Device Boot Start End Blocks Id System/dev/xvde1 1 39162 314568733+ 83 Linux
Command (m for help): w
The partition table has been altered!Calling ioctl() to re-read partition table.
Syncing disks.
3.创建分区文件系统并格式化磁盘
# mkfs.ext4 /dev/xvde1 # 将xvde1以ext4格式进行格式化
[root@qxyw ~]# mkfs.ext4 xvde1 mke2fs 1.41.12 (17-May-2010) Could not stat xvde1 --- No such file or directory The device apparently does not exist; did you specify it correctly?[root@qxyw ~]# mkfs.ext4 /dev/xvde1 mke2fs 1.41.12 (17-May-2010) Filesystem label=OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks19660800 inodes, 78642183 blocks3932109 blocks (5.00%) reserved for the super user First data block=0Maximum filesystem blocks=4294967296 2400 block groups32768 blocks per group, 32768 fragments per group8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 25 mounts or180 days, whichever comes first. Use tune2fs -c or -i to override.
4.在home目录下面创建文件夹mysql，并且将设备挂载至/home/mysql。
[root@qxyw home]# mount /dev/xvde1 /home/mysql [root@qxyw home]# df -h Filesystem Size Used Avail Use% Mounted on/dev/xvda2 36G 2.4G 32G 7% /tmpfs 3.9G 0 3.9G 0% /dev/shm/dev/xvde1 296G 191M 281G 1% /home/mysql
假如原来文件夹中有文件挂载之后文件会消失并且出现lost+found文件夹，这时不用担心，可以用umount命令进行取消挂载。
原因是这样的。
这个牵扯到linux的VFS（虚拟文件系统）机制。登录以后，你看到的各个目录，文件都是内核在加载时候构造在内存中的VFS目录树，而不是直接看到硬盘上的实际目录树。
按照我对这篇文章所描述的粗浅理解，当你挂载某个设备到一个VFS挂载点上时(比如/home），系统就把VFS中的这个挂载点/home指向你最后所挂载的那个设备上。那么你现在访问该挂载点时，就会看到你最后挂载在此处的设备。而之前所挂载的设备依然在那里，只不过挂载点/home已经不再指向之前的设备。你可以把原来的设备卸载以后挂载到一个新的挂载点上来访问。
5.将磁盘UUID写入fstab
[root@qxyw ~]# blkid /dev/xvda1: UUID="5546dd0c-ef40-451b-b266-df8ef3a49967" TYPE="swap" /dev/xvda2: UUID="77fc0962-b3cf-400a-8903-0632e077fa09" TYPE="ext3" /dev/xvde1: UUID="1d17945b-c369-42de-85a8-47217d24d3e5" TYPE="ext4"
2）通过vim /etc/fstab在最后一行添加xvde1的磁盘信息
# # /etc/fstab # Created by anaconda on Thu Jan 12 02:47:21 2017# # Accessible filesystems, by reference, are maintained under '/dev/disk'# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info# UUID=77fc0962-b3cf-400a-8903-0632e077fa09 / ext3 defaults 1 1UUID=5546dd0c-ef40-451b-b266-df8ef3a49967 swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 UUID=d17945b-c369-42de-85a8-47217d24d3e5 /home/mysql ext4 defaults 0 0
6.将/var/lib/mysql/下的内容转移至/home/mysql/，并且在/var/lib/下创建mysql的链接，实际目录其实为/home/mysql
[root@qxyw /]# cd home[root@qxyw home]# mkdir mysql [root@qxyw home]# mv /var/lib/mysql/* /home/mysql[root@qxyw home]# ln /home/mysql /var/lib/mysql
7.验证一下，通过df命令查看磁盘的使用情况。然后进入mysql命令，创建数据库test1...，执行之后会在/home/mysql/文件夹下出现数据库test1，另外使用df命令查看磁盘使用情况。会发现/dev/xvde1使用量在增长。
[root@qxyw mysql]# df Filesystem 1K-blocks Used Available Use% Mounted on/dev/xvda2 37155392 2417608 32850400 7% /tmpfs 4018012 0 4018012 0% /dev/shm/dev/xvde1 309633052 217092 293687524 1% /home/mysql
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