1、增加硬盘
2可以看到磁盘并没有马上认出来
3、由于不知道新增硬盘挂载的位置，可以先查看现有硬盘挂载的适配器。
4、发现正在磁盘挂载到host0，可以尝试使用下边命令，重新扫描host0信息
echo "- - -" > /sys/class/scsi_host/host0/scan
5、再次有fdisk -l可以看到新的磁盘已经扫出来了
image.png
以下开始创建分区
格式化分区
挂载分区
扩容：（需要关机）
卸载分区
umount /dev/sdb1
删除并重新建分区
[root@localhost ~]# fdisk /dev/sdb
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.
Command (m for help): p
Disk /dev/sdb: 16.1 GB, 16106127360 bytes, 31457280 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: 0xead24600
Device Boot Start End Blocks Id System
/dev/sdb1 2048 20971519 10484736 83 Linux
Command (m for help): d
Selected partition 1
Partition 1 is deleted
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-31457279, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-31457279, default 31457279):
Using default value 31457279
Partition 1 of type Linux and of size 15 GiB is set
Command (m for help): p
Disk /dev/sdb: 16.1 GB, 16106127360 bytes, 31457280 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: 0xead24600
Device Boot Start End Blocks Id System
/dev/sdb1 2048 31457279 15727616 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
检查并变更文件系统大小
[root@localhost ~]# e2fsck -f /dev/sdb1
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdb1: 13/655360 files (0.0% non-contiguous), 79698/2621184 blocks
[root@localhost ~]# resize2fs /dev/sdb1
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/sdb1 to 3931904 (4k) blocks.
The filesystem on /dev/sdb1 is now 3931904 blocks long.
重新挂载
mount /dev/sdb1 /mydata
查看数据是否存在（可保留原数据）
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 17G 1.1G 16G 7% /
devtmpfs 476M 0 476M 0% /dev
tmpfs 488M 0 488M 0% /dev/shm
tmpfs 488M 7.7M 480M 2% /run
tmpfs 488M 0 488M 0% /sys/fs/cgroup
/dev/sda1 1014M 130M 885M 13% /boot
tmpfs 98M 0 98M 0% /run/user/0
/dev/sdb1 15G 26M 14G 1% /mydata
[root@localhost ~]# cd /mydata/
[root@localhost mydata]# ll
total 24
drwx------. 2 root root 16384 Jun 11 04:19 lost+found
drwxr-xr-x. 2 root root 4096 Jun 11 04:26 test
-rw-r--r--. 1 root root 4 Jun 11 04:26 test.txt
