$ fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x070d6722.
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 //创建新分区
Command action
e extended
p primary partition (1-4)
p //创建为主分区
Partition number (1-4): 1 //分区号
First cylinder (1-133674, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-133674, default 133674):
Using default value 133674
Command (m for help): t //设置分区为lvm, 因为根分区为lvm
Selected partition 1
Hex code (type L to list codes): 8e //lvm类型
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w //保存退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
