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hpr1228 :: Utilizing Maximum Space on a Cloned BTRFS Partition

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Hosted by FiftyOneFifty on 2013-04-17 is flagged as Explicit and is released under a CC-BY-SA license.
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Utilizing Maximum Space on a Cloned BTRFS Partition

by FiftyOneFifty

  1. If you clone a disk to a disk, Clonezilla will increase (decrease) the size of each partition proportional to the relative size of the drives.
    1. I wanted to keep my / the same size and have no swap (new drive was SSD), so I did a partion to partion clone instead
    2. Created partions on the new SSDs with a GParted Live CD, 12Gb root (Ext4) and the remained for /home, (btrfs, because I planned to move to SSD from the start, and last summer only btrfs supported TRIM)
  2. After cloning /dev/sda1 to /dev/sdb1 and /dev/sda2 to /dev/sdb2 using Clonezilla, I inspected the new volumes with the GParted Live CD
    1. /dev/sdb2 had 40% unaccessable space, i.e., the usable space was the same size as the old /home volume
    2. GParted flagged the error and said I could correct it from the menu (Partition->Check) but btrfs doesn't support fsck, so it didn't work
    3. Tried shrinking the volume in GParted and re-expanding it to take up the free space, also didn't work.
  3. Discovered 'btrfs utility' and that it was supported by the GParted Live CD
    1. Make a mount point
      1. sudo mkdir /media/btrfs
    2. Mount the btrfs volume
      1. sudo mount /dev/sdb2 /media/btrfs
    3. Use btrfs utility to expand the btrfs file system to the maximun size of the volume
      1. sudo btrfs filesystem resize max /media/btrfs
    4. Unmount the btrfs volume
      1. sudo umount /dev/sdb2
  4. Rechecked /dev/sdb2 with GParted, I no longer had unaccessible space

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Comment #1 posted on 2013-04-25T12:32:10Z by pokey

Nice one

Thanks for keeping the network alive, 5150, and for doing it with style. :)

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