我在容量为 160GB 的 ssd 上安装了 cent-os 7。Cent-os 分区总共只消耗 20GB，所以当我运行时，fdisk -l这是我的输出：
Disk /dev/sda: 171.8 GB, 171798691840 bytes, 335544320 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
Disk label type: dos
Disk identifier: 0x000a2b1e
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 41943039 20458496 8e Linux LVM
Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, …