新增分割區

1. fdisk 在硬碟 /dev/vda 分割一塊 LVM 分割區，目前只有兩個分割區。

   [root@kvm10 ~]# fdisk /dev/vda
   
   Welcome to fdisk (util-linux 2.32.1).
   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/vda: 8 GiB, 8589934592 bytes, 16777216 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: dos
   Disk identifier: 0x2812136d
   
   Device     Boot  Start      End  Sectors  Size Id Type
   /dev/vda1  *      2048   411647   409600  200M 83 Linux
   /dev/vda2       411648 15771647 15360000  7.3G 8e Linux LVM
   

2. n 新增分割區：硬碟 MBR 最多只能存 4 個分割區，目前只有兩個分割區，如果沒有要再新增多於兩個分割區，可以直接將硬碟剩餘空間「全部」分割為 LVM 的分割區，全部都按「Enter」接受系統建議值。

   Command (m for help): n
   Partition type
      p   primary (2 primary, 0 extended, 2 free)
      e   extended (container for logical partitions)
   Select (default p): 
   
   Using default response p.
   Partition number (3,4, default 3): 
   First sector (15771648-16777215, default 15771648): 
   Last sector, +sectors or +size{K,M,G,T,P} (15771648-16777215, default 16777215): 
   Created a new partition 3 of type 'Linux' and of size 491 MiB.
   

3. p 列出目前分割區，新增的 vda3，type 是 Linux。

   Command (m for help): p
   Disk /dev/vda: 8 GiB, 8589934592 bytes, 16777216 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: dos
   Disk identifier: 0x2812136d
   
   Device     Boot    Start      End  Sectors  Size Id Type
   /dev/vda1  *        2048   411647   409600  200M 83 Linux
   /dev/vda2         411648 15771647 15360000  7.3G 8e Linux LVM
   /dev/vda3       15771648 16777215  1005568  491M 83 Linux
   

4. t 修改新增的 vda3，type 為 Linux LVM (8e)。

   Command (m for help): t
   Partition number (1-3, default 3): 
   Hex code (type L to list all codes): 8e
   
   Changed type of partition 'Linux' to 'Linux LVM'.
   

5. p 再列出目前分割區，vda3 type 為 Linux LVM (8e)。

   Command (m for help): p
   Disk /dev/vda: 8 GiB, 8589934592 bytes, 16777216 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: dos
   Disk identifier: 0x2812136d
   
   Device     Boot    Start      End  Sectors  Size Id Type
   /dev/vda1  *        2048   411647   409600  200M 83 Linux
   /dev/vda2         411648 15771647 15360000  7.3G 8e Linux LVM
   /dev/vda3       15771648 16777215  1005568  491M 8e Linux LVM
   

6. w 儲存並退出，RHEL/CentOS 8 自動重新偵測並載入分割表，不用再執行 partprobe 或 kpart，就可以直接使用新的分割區。

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