setting up lvm2 ans thin tools

install

debian

apt install lvm2 thin-provisioning-tools

slackware

sbopkg -i thin-provisioning-tools

from source

see lvm2-source

setup

cd /etc/lvm/
mv -i lvm.conf lvm.conf.dist
sed -r '/^[[:space:]]*#.*/d; /^$/d;' lvm.conf.dist > lvm.conf.clean
sed -r '/^[[:space:]]*#.*/d; /^$/d;' lvm.conf.dist > lvm.conf
vi lvm.conf

devices {
    obtain_device_list_from_udev = 0
    issue_discards = 1
}

resources

https://slackbuilds.org/repository/15.0/system/thin-provisioning-tools/

filesystem freeze

Difference between fsfreeze and lvm snapshot https://unix.stackexchange.com/questions/157033/difference-between-fsfreeze-and-lvm-snapshot

An LVM snapshot of an ext4 fs does not seem very clean https://serverfault.com/questions/539209/an-lvm-snapshot-of-an-ext4-fs-does-not-seem-very-clean