通常情况下，云平台开出来的服务器只有默认的系统盘，而数据盘需要运维人员自己挂载在数据目录，此篇记录centos磁盘挂载的过程，以便今后遇到类似情况便于查看。
系统版本：centos7.9
1、查看磁盘情况：
[root@xus ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.9G 0 7.9G 0% /dev/shm
tmpfs 7.9G 17M 7.8G 1% /run
tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup
/dev/vda1 20G 2.4G 18G 12% /
/dev/vdb1 69G 24K 66G 1% /dataext
tmpfs 1.6G 0 1.6G 0% /run/user/0
2、查看磁盘挂载
[root@xus ~]# fdisk -l
# /dev/vda已经做了分区
Disk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 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: 0x0000c4baDevice Boot Start End Blocks Id System
/dev/vda1 * 2048 41929649 20963801 83 Linux# /dev/vdb已经做了分区,如果还有未分区的空间，就没有下面的 /dev/vdb1 分区
Disk /dev/vdb: 75.2 GB, 75161927680 bytes, 146800640 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: 0xf8c48eecDevice Boot Start End Blocks Id System
/dev/vdb1 2048 146800639 73399296 83 Linux
3、分区(操作完分区步骤后，就会看到步骤2的结果)
[root@xus ~]# fdisk /dev/vdb
welcome to fdisk (util-linux 2.23.2)
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command .
Device does not contain a recognized partition tableBuilding a new DOs disklabel with disk identifier 0x774b38c4
Command (m for help): #输入n回车，添加新分区，如果需要更多，请输入m回车看帮助Partition type:p primary (0 primary, extended, 4 free)e extended
select (default p): # 输入p回车，P的意思是主分区Partition number (1-4): # 输入数字1回车，分区数量First sector (2048-20971519，default 2048): #认回车
Using default value 2048Last sector，+sectors or +sizefk,M,G) (2048-419430399，default 419430399): # 默认回车
Using default value 419430399
Partition 1 of type Linux and of size 200GiB is setCommand (m for help): # 输入w保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
4、格式化分区
[root@xus ~]# mkfs.ext4 /dev/vdb1
5、建立挂载目录
[root@xus ~]# mkdir /dataext
6、挂载分区
[root@xus ~]# mount /dev/vdb1 /dataext
7、设置开机自动挂载
[root@xus ~]# echo /dev/vdb1 /dataext ext4 defaults 0 0 >> /etc/fstab
8.确认是否挂载成功
[root@xus ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.9G 0 7.9G 0% /dev/shm
tmpfs 7.9G 17M 7.8G 1% /run
tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup
/dev/vda1 20G 2.4G 18G 12% /
/dev/vdb1 69G 24K 66G 1% /dataext #这是挂载完的磁盘
tmpfs 1.6G 0 1.6G 0% /run/user/0
9、重启系统
[root@xus ~]# reboot
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