新增分割區

1. fdisk 進行 vdb 分割區管理。

   [root@kvm10 ~]# fdisk /dev/vdb
   
   Welcome to fdisk (util-linux 2.40.2).
   Changes will remain in memory only, until you decide to write them.
   Be careful before using the write command.
   
   This disk is currently in use - repartitioning is probably a bad idea.
   It's recommended to umount all file systems, and swapoff all swap
   partitions on this disk.
   

2. 命令 m：可以查看輔助說明

   Command (m for help): m
   
   Help:
   
     GPT
      M   enter protective/hybrid MBR
   
     Generic
      d   delete a partition
      F   list free unpartitioned space
      l   list known partition types
      n   add a new partition
      p   print the partition table
      t   change a partition type
      v   verify the partition table
      i   print information about a partition
      e   resize a partition
   
     Misc
      m   print this menu
      x   extra functionality (experts only)
   
     Script
      I   load disk layout from sfdisk script file
      O   dump disk layout to sfdisk script file
   
     Save & Exit
      w   write table to disk and exit
      q   quit without saving changes
   
     Create a new label
      g   create a new empty GPT partition table
      G   create a new empty SGI (IRIX) partition table
      o   create a new empty MBR (DOS) partition table
      s   create a new empty Sun partition table
   

3. 命令 p：列出分割表，目前有 vdb1 一個分割區。

   Command (m for help): p
   
   Disk /dev/vdb: 3 GiB, 3221225472 bytes, 6291456 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
   Disklabel type: gpt
   Disk identifier: 289C3DC7-CC6A-489A-9CB5-552D550FDAD3
   
   Device     Start    End Sectors  Size Type
   /dev/vdb1   2048 821247  819200  400M Linux LVM
   

4. 命令 n：新增分割區，都直接按 Enter 使用預設建議：新增編號 2 的分割區，分割區起始及結尾 sector 都用建議值，使用 vdb 剩餘所有空間。

   Command (m for help): n
   Partition number (2-128, default 2): 
   First sector (821248-6291422, default 821248): 
   Last sector, +/-sectors or +/-size{K,M,G,T,P} (821248-6291422, default 6289407): 
   
   Created a new partition 2 of type 'Linux filesystem' and of size 2.6 GiB.
   

5. 命令 p：再列出分割區，出現 vdb2 分割區。

   Command (m for help): p
   Disk /dev/vdb: 3 GiB, 3221225472 bytes, 6291456 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
   Disklabel type: gpt
   Disk identifier: 289C3DC7-CC6A-489A-9CB5-552D550FDAD3
   
   Device      Start     End Sectors  Size Type
   /dev/vdb1    2048  821247  819200  400M Linux LVM
   /dev/vdb2  821248 6289407 5468160  2.6G Linux filesystem
   

6. 命令 t：變更 vdb2 分割區的 Type。

   Command (m for help): t
   Partition number (1,2, default 2):
   

7. 命令 L：查詢 Type 編號。

   Partition type or alias (type L to list all): L
     1 EFI System                     C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     2 MBR partition scheme           024DEE41-33E7-11D3-9D69-0008C781F39F
     3 Intel Fast Flash               D3BFE2DE-3DAF-11DF-BA40-E3A556D89593
     4 BIOS boot                      21686148-6449-6E6F-744E-656564454649
   ..........................................................
    44 Linux LVM                      E6D6D379-F507-44C2-A23C-238F2A3DF928
   ..........................................................
   

8. 命令 44：使用 Linux LVM Type。

   Partition type or alias (type L to list all): 44
   
   Changed type of partition 'Linux filesystem' to 'Linux LVM'.
   

9. 命令 p：再列出分割區 vdb2 的 Type 已改成 Linux LVM。

   Command (m for help): p
   Disk /dev/vdb: 3 GiB, 3221225472 bytes, 6291456 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
   Disklabel type: gpt
   Disk identifier: 289C3DC7-CC6A-489A-9CB5-552D550FDAD3
   
   Device      Start     End Sectors  Size Type
   /dev/vdb1    2048  821247  819200  400M Linux LVM
   /dev/vdb2  821248 6289407 5468160  2.6G Linux LVM
   

10. 命令 w：寫入分割區表並退出。

    Command (m for help): w
    The partition table has been altered.
    Syncing disks.
    

11. lsblk 查詢硬碟，已出現 vdb2。

    [root@kvm10 ~]# lsblk 
    NAME              MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
    vda               252:0    0    6G  0 disk 
    ├─vda1            252:1    0    1M  0 part 
    ├─vda2            252:2    0  500M  0 part /boot
    └─vda3            252:3    0  4.4G  0 part 
      ├─vg_kvm10-root 253:0    0  4.3G  0 lvm  /
      └─vg_kvm10-swap 253:1    0  124M  0 lvm  [SWAP]
    vdb               252:16   0    3G  0 disk 
    ├─vdb1            252:17   0  400M  0 part 
    │ └─myvdb-vo      253:2    0  252M  0 lvm  /reports
    └─vdb2            252:18   0  2.6G  0 part