之前因为比较忙，导致树莓派一直在吃灰，同时，貌似官方推荐的Raspbian有点儿问题，配置文件一直保存不了，然后看着别人玩儿Arch好像很不错的样子就试玩了一把，其中装系统没啥说的，关键是分区，Arch Linux提供给树莓派的是img镜像，导致镜像多大，总共可用的空间就多大，这明显是不能接受的，所以搜索了一下，把分区搞定了，最近确实变懒了，直接上转载来的文章
转载地址为：http://blog.sina.com.cn/s/blog_578925940101gt5p.html 如有问题请及时联系我我随时撤销掉
Arch Linux 3.6.11-14-ARCH+ (ttyAMA0)
alarmpi login: root
鳳assword:
Last login: Thu Jan 1 00:00:18 on ttyAMA0
[root@alarmpi ~]# ls
[root@alarmpi ~]# fdisk /dev/mmcblk0
Welcome to fdisk (util-linux 2.23.1).
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/mmcblk0: 7969 MB, 7969177600 bytes, 15564800 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: 0x00057540
/dev/mmcblk0p1 2048 186367 92160 c W95 FAT32 (LBA)//这里是引导区,不变
/dev/mmcblk0p2 186368 3667967 1740800 5 Extended //扩展分区需要重建
/dev/mmcblk0p5 188416 3667967 1739776 83 Linux //逻辑分区需要重建
Command (m for help): d
Partition number (1,2,5, default 5): //直接回车，取默认 5，顺序要保证是先5，后2
Partition 5 is deleted
Command (m for help): p
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes, 15564800 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: 0x00057540
/dev/mmcblk0p1 2048 186367 92160 c W95 FAT32 (LBA)
/dev/mmcblk0p2 186368 3667967 1740800 5 Extended
Command (m for help): d
Partition number (1,2, default 2): //直接回车，取默认 2
Partition 2 is deleted
Command (m for help): p
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes, 15564800 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: 0x00057540
/dev/mmcblk0p1 2048 186367 92160 c W95 FAT32 (LBA)
Command (m for help): n
Partition type:
Select (default p): e//建扩展分区
Partition number (2-4, default 2):
First sector (186368-15564799, default 186368):
Using default value 186368
Last sector, +sectors or +size{K,M,G} (186368-15564799, default 15564799):
Using default value 15564799
Partition 2 of type Extended and of size 7.3 GiB is set
Command (m for help): p
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes, 15564800 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: 0x00057540
/dev/mmcblk0p1 2048 186367 92160 c W95 FAT32 (LBA)
/dev/mmcblk0p2 186368 15564799 7689216 5 Extended
Command (m for help): n
Partition type:
Select (default p): l//建逻辑分区
Adding logical partition 5
First sector (188416-15564799, default 188416):
Using default value 188416
Last sector, +sectors or +size{K,M,G} (188416-15564799, default 15564799):
Using default value 15564799
Partition 5 of type Linux and of size 7.3 GiB is set
Command (m for help): p
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes, 15564800 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: 0x00057540
/dev/mmcblk0p1 2048 186367 92160 c W95 FAT32 (LBA)
/dev/mmcblk0p2 186368 15564799 7689216 5 Extended
/dev/mmcblk0p5 188416 15564799 7688192 83 Linux
Command (m for help): w
The partition table has been altered!
然后重启, 进入系统后执行
ln -s /dev/mmcblk0p5 /dev/root
resize2fs /dev/root
结果：
[root@alarmpi ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 7.3G 446M 6.5G 7% /
devtmpfs 83M 0 83M 0% /dev
tmpfs 231M 0 231M 0% /dev/shm
tmpfs 231M 248K 231M 1% /run
tmpfs 231M 0 231M 0% /sys/fs/cgroup
tmpfs 231M 0 231M 0% /tmp
/dev/mmcblk0p1 90M 24M 67M 27% /boot