问题描述：

rk3399开发板烧录官网提供的ubuntu镜像： ubuntu 16.04 server arm64(下载地址：https://www.96boards.org/documentation/consumer/rock/downloads/ubuntu.md.html),

开发板上电运行查看系统根目录容量已使用96%：

root@rock960:~# df

filesystem 1k-blocks used available use% mounted on

/dev/root 1515376 1353320 67032 96% /

devtmpfs 1951660 0 1951660 0% /dev

tmpfs 1952236 0 1952236 0% /dev/shm

tmpfs 1952236 49692 1902544 3% /run

tmpfs 5120 0 5120 0% /run/lock

tmpfs 1952236 0 1952236 0% /sys/fs/cgroup

tmpfs 390448 0 390448 0% /run/user/0

root@rock960:~#

再查看磁盘容量，32gb emmc实际可用容量29gb，除去已分区容量还有27.5gb容量未分区：

root@rock960:~# fdisk -l /dev/mmcblk1

disk /dev/mmcblk1: 29.1 gib, 31268536320 bytes, 61071360 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: f464c417-6f1f-4bf8-a1ce-bdb432a3bd1b

device start end sectors size type

/dev/mmcblk1p1 64 8063 8000 3.9m linux filesystem

/dev/mmcblk1p2 16384 24575 8192 4m linux filesystem

/dev/mmcblk1p3 24576 32767 8192 4m linux filesystem

/dev/mmcblk1p4 32768 262143 229376 112m efi system

/dev/mmcblk1p5 262144 3409886 3147743 1.5g linux filesystem

root@rock960:~#

因此需要把未分区的27.5gb磁盘空间追加到/dev/mmcblk1p5并扩容rootfs文件系统。解决方法主要用到两个命令：parted和resize2fs。

首先重新分配/dev/mmcblk1p5分区大小到覆盖整个磁盘剩余容量：(注意fdisk不支持gpt分区)

root@rock960:~# parted /dev/mmcblk1

gnu parted 3.2

using /dev/mmcblk1

welcome to gnu parted! type 'help' to view a list of commands.

(parted) print

model: mmc bjnb4r (sd/mmc)

disk /dev/mmcblk1: 31.3gb

sector size (logical/physical): 512b/512b

partition table: gpt

disk flags:

number start end size file system name flags

1 32.8kb 4129kb 4096kb loader1

2 8389kb 12.6mb 4194kb loader2

3 12.6mb 16.8mb 4194kb trust

4 16.8mb 134mb 117mb fat16 boot boot, esp

5 134mb 1746mb 1612mb ext4 rootfs

(parted) unit s

(parted) print

model: mmc bjnb4r (sd/mmc)

disk /dev/mmcblk1: 61071360s

sector size (logical/physical): 512b/512b

partition table: gpt

disk flags:

number start end size file system name flags

1 64s 8063s 8000s loader1

2 16384s 24575s 8192s loader2

3 24576s 32767s 8192s trust

4 32768s 262143s 229376s fat16 boot boot, esp

5 262144s 3409886s 3147743s ext4 rootfs

(parted) resizepart 5 100%

(parted) print

model: mmc bjnb4r (sd/mmc)

disk /dev/mmcblk1: 61071360s

sector size (logical/physical): 512b/512b

partition table: gpt

disk flags:

number start end size file system name flags

1 64s 8063s 8000s loader1

2 16384s 24575s 8192s loader2

3 24576s 32767s 8192s trust

4 32768s 262143s 229376s fat16 boot boot, esp

5 262144s 61071326s 60809183s ext4 rootfs

(parted) q

root@rock960:~#

然后进行ext文件系统扩容：

root@rock960:~# resize2fs /dev/mmcblk1p5

resize2fs 1.42.13 (17-may-2015)

the filesystem is already 7601147 (4k) blocks long. nothing to do!

root@rock960:~#

这时查看根目录下已使用容量已经变成5%

root@rock960:~# df -th

filesystem type size used avail use% mounted on

/dev/root ext4 31g 1.4g 28g 5% /

devtmpfs devtmpfs 2.0g 0 2.0g 0% /dev

tmpfs tmpfs 2.0g 0 2.0g 0% /dev/shm

tmpfs tmpfs 2.0g 51m 2.0g 3% /run

tmpfs tmpfs 5.3m 0 5.3m 0% /run/lock

tmpfs tmpfs 2.0g 0 2.0g 0% /sys/fs/cgroup

tmpfs tmpfs 400m 0 400m 0% /run/user/0

root@rock960:~#

后续：

tbd