Description: The disk is full, add two disk space
Environment: centos7, VMware Workstation
Adding hard disk
Add two hard drives
Into the system to see if the added successfully
fdisk –l |grep dev
disk partition
First, sdb operation
fdisk /dev/sdb
Commonly used commands Description:
the n-: create a new partition
d: Delete existing partitions
t: Modify the partition type
l: to see all types
p: shows the existing partition information
w: Save and exit
q: exit without saving
m: View help information
View existing partition, there is no data in the device the following line, indicating no saved partition
Create a new partition, enter n start
Description: Here, e is the extended partition, p is the primary partition, we enter p, or default is p, directly enter.
Description: Sets a primary partition, primary partition number defaults to 1 ,. The default setting for the first sector number 2048, the last sector of the data disk number 41943039.20G a new primary partition.
View details of the new partition again
w and enter the result is written to the partition table in the partition
The partition into force and synchronized to the system
partprobe /dev/sdb
On / dev / sdb formatted
mkfs –t ext4 /dev/sdb
mount /dev/sdb /root/mountdata
Mount the partition
After formatting is complete Mounting partitions
First create a mount point
mkddir /root/mountdata
Manually mount the disk mount point
mount /dev/sdb /root/mountdata
Set to boot automatically mount
vim /etc/fstab
Add the following information
/dev/sdb/ /root/mountdata/ ext4 defaults 0 0
Description: / dev / sdb: partition name; / root / mountdata /: Mount path; ext4: disk format; 00: Other default
或者使用UUID进行挂载，这里对/dev/sdc进行操作
如果使用/dev/sdb的方法，可能会出现找不到设备而加载失败的问题。uuid作为系统中存储设备提供的唯一标志字符串，使用UUID则不会出现这样的情况。
查看uuid的三种办法
blkid
lsblk -f
ll /dev/disk/by-uuid/
通过uuid添加自动挂载磁盘信息（vim /etc/fstab）,格式与前面的类似
UUID=739cbb88-b375-4b56-8e1f-f1c31840bf3c /root/mountdata_sdc/ ext4 defaults 0 0
自动挂载/etc/fstab里面的东西
mount –a
如果在fstab里没有新增加设备，则没有输出，mount会自动忽略已经完成的操作。
查看挂载的情况，两块磁盘已经挂上去了，已经可以用了
df -h
重启服务器测试，发现可以自动挂载了
磁盘的卸载
umount /dev/sdc 永久卸载 vim /etc/fstab 把添加的磁盘信息删除 fdisk /dev/sdv 输入d,删除添加的磁盘，然后w保存