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磁盘升级到20g 
流量升级到1T 
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20g硬盘扩容方法 
升级前确认信息 
root@DMIT:~# fdisk -l
Disk /dev/vda: 20 GiB, 21474836480 bytes, 41943040 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: 0x62d29727

Device     Boot Start      ...