zfs usage

disk=/dev/sdb
disk=/dev/vdb

assuming second scsi disk is entirely free

mkdir /smith/
touch /smith/NOT_MOUNTED

zpool create smith $disk

check

zpool history smith
zpool list
zpool status -v smith

zfs create -s -V 25GB smith/debian_tpl

zfs list
zfs get compression smith

df -hT /smith/
ls -lhF /smith/

create a read-write snapshot

zfs snapshot smith@test1
zfs clone smith@test1 smith/clone

zfs list -t snapshot
zfs get origin smith/clone

resources

https://blog.victormendonca.com/2020/11/03/zfs-for-dummies/

concepts

https://openzfs.github.io/openzfs-docs/Basic%20Concepts/RAIDZ.html

snapshot clone

https://www.illumos.org/books/zfs-admin/snapshots.html#gbcyg