> apt install zfsutils-linux

> zpool create -m /var/lib/postgresql pg_datadir mirror /dev/nvme2n1 /dev/nvme3n1
> zpool list
NAME         SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
pg_datadir  2.91T   284K  2.91T        -         -     0%     0%  1.00x    ONLINE  -

> zpool status
  pool: pg_datadir
 state: ONLINE
config:

	NAME         STATE     READ WRITE CKSUM
	pg_datadir   ONLINE       0     0     0
	  mirror-0   ONLINE       0     0     0
	    nvme2n1  ONLINE       0     0     0
	    nvme3n1  ONLINE       0     0     0

errors: No known data errors

> zfs set compression=lz4    pg_datadir
> zfs set recordsize=16K     pg_datadir
> zfs set logbias=latency    pg_datadir
> zfs set atime=off          pg_datadir

> mkdir -p /var/lib/postgresql/16/main
> chown -R postgres:postgres /var/lib/postgresql/
> chmod 700 /var/lib/postgresql/16/main

> mount | grep postgresql

> zfs get mountpoint,compression,encryption,logbias,recordsize
NAME        PROPERTY     VALUE                SOURCE
pg_datadir  mountpoint   /var/lib/postgresql  local
pg_datadir  compression  lz4                  local
pg_datadir  encryption   off                  default
pg_datadir  logbias      latency              local
pg_datadir  recordsize   16K                  local

> df -h
Filesystem      Size  Used Avail Use% Mounted on
...
pg_datadir      2.9T   40M  2.9T   1% /var/lib/postgresql