fdisk命令參數及其作用
| 參數 | 作用 |
|---|---|
| m | 查看全部可用的參數 |
| n | 添加新的分區 |
| d | 刪除某個分區信息 |
| l | 列出所有可用的分區類型 |
| t | 改變某個分區的類型 |
| p | 查看分區表信息 |
| w | 保存並退出 |
| q | 不保存直接退出 |
分區——>格式化——>掛載
#磁盤分區
[root@136_3 ~]# 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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x90e0e77f.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
#磁盤格式化
[root@136_3 ~]# mkfs.xfs /dev/sdb1
meta-data=/dev/sdb1 isize=512 agcount=4, agsize=1310656 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5242624, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
#查看硬盤信息
[root@136_3 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 894M 0 894M 0% /dev
tmpfs 910M 0 910M 0% /dev/shm
tmpfs 910M 11M 900M 2% /run
tmpfs 910M 0 910M 0% /sys/fs/cgroup
/dev/mapper/centos-root 37G 4.2G 33G 12% /
/dev/sda1 1014M 239M 776M 24% /boot
tmpfs 182M 28K 182M 1% /run/user/0
[root@136_3 ~]# mkdir /disk
#掛載磁盤
[root@136_3 ~]# mount /dev/sdb1 /disk
[root@136_3 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 894M 0 894M 0% /dev
tmpfs 910M 0 910M 0% /dev/shm
tmpfs 910M 11M 900M 2% /run
tmpfs 910M 0 910M 0% /sys/fs/cgroup
/dev/mapper/centos-root 37G 4.2G 33G 12% /
/dev/sda1 1014M 239M 776M 24% /boot
tmpfs 182M 28K 182M 1% /run/user/0
/dev/sdb1 20G 33M 20G 1% /disk
[root@136_3 ~]#
使用 mount 掛載的設備文件會在系統下一次重啓的時候失效。如果想讓這個設備文件的掛載永久有效，則需要把掛載的信息寫入到配置文件中。
swap分區專用的
格式化命令是 mkswap
掛載命令 swapon /dev/sdb2
同樣 需要永久生效需要寫入到 /etc/fstab 文件裏