resize2fsを使う
初期状態 ディスクがほぼ占有されている
root@localhost:~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 1663388 1400292 159160 90% / devtmpfs 255768 4 255764 1% /dev none 51176 640 50536 2% /run none 5120 0 5120 0% /run/lock none 255864 68 255796 1% /run/shm
resize2fsを実行
root@localhost:~# resize2fs /dev/mmcblk0p2 resize2fs 1.42 (29-Nov-2011) Filesystem at /dev/mmcblk0p2 is mounted on /; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 The filesystem on /dev/mmcblk0p2 is now 1923840 blocks long.
拡張できた
root@localhost:~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 7431240 1404208 5688688 20% / devtmpfs 255768 4 255764 1% /dev none 51176 640 50536 2% /run none 5120 0 5120 0% /run/lock none 255864 68 255796 1% /run/shm