1. 使用fdisk删除旧分区创建新分区

sudo fdisk /dev/nvme0n1

Welcome to fdisk (util-linux 2.34).
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/nvme0n1: 200 GiB, 214748364800 bytes, 419430400 sectors
Disk model: Amazon Elastic Block Store              
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xc3ddd2ce

Device         Boot Start       End   Sectors  Size Id Type
/dev/nvme0n1p1 *     2048 209715166 209713119  100G 83 Linux

Command (m for help): d
Selected partition 1
Partition 1 has been deleted.

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-419430399, default 2048): 
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-419430399, default 419430399): 

Created a new partition 1 of type 'Linux' and of size 200 GiB.
Partition #1 contains a ext4 signature.

Do you want to remove the signature? [Y]es/[N]o: y

The signature will be removed by a write command.

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

2. 同步分区信息到Linux文件系统

sudo resize2fs /dev/root
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/root is mounted on /; on-line resizing required
old_desc_blocks = 13, new_desc_blocks = 25
The filesystem on /dev/root is now 52428544 (4k) blocks long.

➜  ~ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       194G   97G   97G  51% /

备注：不适用于LVM管理的分区扩容