vdo VS kvdo

It is true that I have not had time to concentrate fully on this issue in the last days, and it is difficult for me to understand some of the subtleties of the subject (english is not my main language). I would like to thank you for your help and patience! I really appreciate it. FYI, I will continue to work on this issue and will update this topic. I've also asked the VDO development team to take a look at it and to tell me if they have any ideas, you can see that discussion here.

No problem, maybe someone else will read it and be able to clarify all of this. I also asked the question on VDO Github repository.

Still working on this project, I can now compile and run LVM VDO under Debian, which is a great thing (I shared the script here).

#!/bin/bash install_dependencies() { (( ${#} > 1 )) && { apt update apt install -y "$@" } || echo "No dependencies to install" } clean_dependencies() { (( ${#} > 1 )) && { apt autoremove --purge -y "$@" } || echo "No dependencies to remove" } clone_repo() { (( ${#} == 1 )) && { TEMPDIR=$(mktemp -d "${1/*\/}.XXX") git clone "$1" "${TEMPDIR}" && \ cd "$TEMPDIR" && pwd -P } } # First part : KVDO module install_dependencies git make "linux-headers-$(uname -r)" > /dev/null 2>&1 WORK_DIR="$(clone_repo https://github.com/tigerblue77/kvdo.git)" ( cd "${WORK_DIR}" && \ make -j"$(nproc)" -C "/usr/src/linux-headers-$(uname -r)" M="${WORK_DIR}" ) > kvdo_log 2>&1 cp "${WORK_DIR}/vdo/kvdo.ko" "${WORK_DIR}/uds/uds.ko" "/lib/modules/$(uname -r)" clean_dependencies git make "linux-headers-$(uname -r)" > /dev/null 2>&1 rm -Rf "${WORK_DIR}" # Second Part: VDO Module install_dependencies git make gcc uuid-dev libz-dev libdevmapper-dev libblkid-dev > /dev/null 2>&1 WORK_DIR="$(clone_repo https://github.com/dm-vdo/vdo.git)" ( cd "${WORK_DIR}" && \ make -j"$(nproc)" && \ make -j"$(nproc)" install ) > vdo_build_log 2>&1 clean_dependencies git make gcc uuid-dev libz-dev libdevmapper-dev libblkid-dev > /dev/null 2>&1 rm -Rf "${WORK_DIR}" # Last Part depmod modprobe kvdo modprobe uds

Update : the project is progressing and I managed to install VDO on Debian 11(.3) : https://github.com/dm-vdo/vdo/issues/47

I wonder didn't they used VDO thin provisioning with LVM2.

Also, a few years ago I've implemented VM management tool called 'vmess', in which the concept is to maintain a tree of QCOW2 files, which R/W snapshots are at the leafs and R/O snapshots are the nodes of the tree. The connection up to the root is made via QCOW2 backing-file store mechanism, so a newly created leaf starts a 0 space. I did this because libvirt+qemu impose various annoying limitations surrounding snapshots-with-in-qcow2, and I liked the idea of file-per-snapshot.

VDO: https://github.com/dm-vdo/kvdo

This is intended for building an rpm, but as far as I can see, you can steal the dkms commands and config file out of it: https://github.com/dm-vdo/kvdo/blob/master/kvdo.spec

git clone https://github.com/dm-vdo/kvdo.git $WORK_DIRECTORY && \

ITYM here.