Resizing SD Card Raspberry Pi to fully use free space
From Iwan
When I was capturing data with tshark I discovered that I my 16GB SD-card was not fully used to store my Wireshark captures on. I investigated why this was and I stumbled up on this article that explained how the disk space could be "released" again.
Releasing the disk space
Verifying the current space
root ##b##ubuntu@RPi2-02:~$ df -h Filesystem Size Used Avail Use% Mounted on root ##b##/dev/mmcblk0p2 1.7G 674M 892M 44% / devtmpfs 458M 4.0K 458M 1% /dev none 4.0K 0 4.0K 0% /sys/fs/cgroup none 93M 240K 93M 1% /run none 5.0M 0 5.0M 0% /run/lock none 462M 0 462M 0% /run/shm none 100M 0 100M 0% /run/user /dev/mmcblk0p1 64M 17M 48M 27% /boot/firmware
Using fdisk to delete and recreate a partition
root ##b##ubuntu@RPi2-02:/$ sudo fdisk /dev/mmcblk0 sudo: unable to resolve host RPi2-02 root ##b##Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) root ##b##Command (m for help): p Disk /dev/mmcblk0: 16.1 GB, 16088301568 bytes 4 heads, 16 sectors/track, 490976 cylinders, total 31422464 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 identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 * 2048 133119 65536 c W95 FAT32 (LBA) root ##b##/dev/mmcblk0p2 133120 3670015 1768448 83 Linux Command (m for help): d root ##b##Partition number (1-4): 2 root ##b##Command (m for help): p Disk /dev/mmcblk0: 16.1 GB, 16088301568 bytes 4 heads, 16 sectors/track, 490976 cylinders, total 31422464 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 identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 * 2048 133119 65536 c W95 FAT32 (LBA) root ##b##Command (m for help): n Partition type: p primary (1 primary, 0 extended, 3 free) e extended root ##b##Select (default p): p root ##b##Partition number (1-4, default 2): 2 root ##b##First sector (133120-31422463, default 133120): 133120 root ##b##Last sector, +sectors or +size{K,M,G} (133120-31422463, default 31422463): Using default value 31422463 root ##b##Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks.
Rebooting
root ##b##ubuntu@RPi2-02:/$ sudo reboot sudo: unable to resolve host RPi2-02 Broadcast message from ubuntu@RPi2-02 (/dev/pts/0) at 7:05 ... root ##b##The system is going down for reboot NOW!
Do another verification of the space
root ##b##ubuntu@RPi2-02:~$ df -h Filesystem Size Used Avail Use% Mounted on root ##b##/dev/mmcblk0p2 1.7G 675M 892M 44% / devtmpfs 458M 4.0K 458M 1% /dev none 4.0K 0 4.0K 0% /sys/fs/cgroup none 93M 240K 93M 1% /run none 5.0M 0 5.0M 0% /run/lock none 462M 0 462M 0% /run/shm none 100M 0 100M 0% /run/user /dev/mmcblk0p1 64M 17M 48M 27% /boot/firmware
Resize the file system
root ##b##ubuntu@RPi2-02:~$ sudo resize2fs /dev/mmcblk0p2 sudo: unable to resolve host RPi2-02 [sudo] password for ubuntu: resize2fs 1.42.9 (4-Feb-2014) Filesystem at /dev/mmcblk0p2 is mounted on /; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 root ##b##The filesystem on /dev/mmcblk0p2 is now 3911168 blocks long.
Reboot again
root ##b##ubuntu@RPi2-02:~$ sudo reboot sudo: unable to resolve host RPi2-02 Broadcast message from ubuntu@RPi2-02 (/dev/pts/1) at 7:17 ... root ##b##The system is going down for reboot NOW!
Verify again
root ##b##ubuntu@RPi2-02:~$ df -h Filesystem Size Used Avail Use% Mounted on root ##b##/dev/mmcblk0p2 15G 676M 14G 5% / devtmpfs 458M 4.0K 458M 1% /dev none 4.0K 0 4.0K 0% /sys/fs/cgroup none 93M 244K 93M 1% /run none 5.0M 0 5.0M 0% /run/lock none 462M 0 462M 0% /run/shm none 100M 0 100M 0% /run/user /dev/mmcblk0p1 64M 17M 48M 27% /boot/firmware
And we have release the space for usage.