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Enable bcache or LVM on existing block devices
Python Augeas Shell
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blocks
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README.md

blocks

Conversion tools for block devices.

Convert between raw partitions, logical volumes, and bcache devices witout moving data. blocks shuffles blocks and sprouts superblocks.

LVM conversion

blocks to-lvm takes a partition containing a filesystem, shrinks the filesystem by a small amount, and converts the partition to LVM in place. LVM gives you extra flexibility by allowing you to grow the filesystem to multiple disks or to follow up with an in-place RAID conversion.

A new volume group is created, the partition is converted to a physical volume and the filesystem is converted to a logical volume.

The new volume group can then be merged with other volume groups using vgmerge, or extended with vgextend. RAID can be enabled with lvconvert.

bcache conversion

blocks to-bcache converts a block device (partition or logical volume) to use bcache. A development version of the bcache cli utilities is required. At runtime (but not during conversion), you need a kernel that reads a slightly updated bcache format:

Requirements

Python 3.3, pip and Git are required before installing.

You will also need libparted (2.3 or newer, library and headers) and libaugeas (library only, 1.0 or newer).

On Debian/Ubuntu (raring is recommended):

sudo aptitude install python3.3 python3-pip git libparted-dev libaugeas0 \
    pkg-config libpython3.3-dev
sudo aptitude install cryptsetup lvm2 \
    nilfs-tools reiserfsprogs xfsprogs e2fsprogs  # optional
type pip-3.3 || alias pip-3.3='python3.3 -m pip.runner'

Command-line tools for LVM2, LUKS, bcache (see above), filesystem resizing (see below for btrfs) are needed if those formats are involved. Kernel support isn't required however, so you can do bcache conversions from a live-cd/live-usb for example.

For btrfs resizing, you need a package that provides btrfs-show-super, or you can install from source:

Installation

pip-3.3 install --user -r <(wget -O- https://raw.github.com/g2p/blocks/master/requirements.txt)
cp -lt ~/bin ~/.local/bin/blocks

Usage (LVM conversion)

blocks --help
blocks to-lvm --help
sudo blocks to-lvm /dev/sdaN

If blocks isn't in the shell's command path, replace with:

sudo python3.3 -m blocks

Don't forget to update /etc/fstab (no change is needed if filesystems are mounted by uuid). If necessary, rebuild the grub config (grub2 needs to install some modules to boot to LVM directly) and your initramfs.

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