Solved importing zfs dataset from an external drive to new machine

NapoleonWils0n

Active Member

Reaction score: 110
Messages: 248

Hi

I have just installed Freebsd on my old Macmini and want to transfer zfs datasets from a usb drive to the macmini

I just need to copy across some data and set up a few config files to get macmini set up,
so i can finally ditch osx and go full freebsd on all my machines

Is it possible to do a zfs send recv from the datasets on the usb drive to the datasets on the macmini

Note from future self to past self:
You can send zfs datasets from a usb drive to datasets on another computer using send recv

I had to set the altroot when i imported the zfs pool

Bash:
# zpool import -o altroot=/mnt/usb zbackup
then use zfs send recv to send the snapshots

Bash:
# zfs send -Rv zbackup/zroot/data/desktop@freebsd-12.1 | zfs recv -F zroot/data/desktop
after sending the snapshots i set the mount point

Bash:
# zfs set mountpoint=/usr/home/djwilcox/Desktop zroot/data/desktop
and finally mount the datasets

Bash:
# zfs mount -a
job done

First question:
When i import the zpool on the new machine the datasets for my home are mounted in my home directory,
so the zfs dataset for my Desktop is mounted over the current Desktop if that makes sense

Bash:
# zpool import zbackup
What i want to do is mount the zbackup pool to /mnt/usb,
which is a mount point i have created

The zbackup pool has its zfs mount point set to /mnt/usb, like so

Bash:
# zfs set mountpoint=/mnt/usb zbackup
I guess i need to set the altroot to /mnt/usb or something on macmini

Second question:
Is it possible to do a zfs send recv of the datasets from the the usb drive to the datasets on the macmini

something like this
Bash:
# zfs send -Rv zbackup/zroot/data/desktop@freebsd-12.1 | zfs recv -F zroot/data/desktop
Or should i try and mount the zpool to /mnt/usb and then use rsync or cp -Rpv,
to copy the data from the usb to the zfs datasets i have created on the macmini

On the macmini i have created all the zfs datasets

Bash:
# zfs create zroot/data
# zfs create zroot/data/desktop
# zfs create zroot/data/documents
# zfs create zroot/data/downloads
# zfs create zroot/data/git
# zfs create zroot/data/config
# zfs create zroot/data/emacsd
# zfs create zroot/data/local
# zfs create zroot/data/mozilla
# zfs create zroot/data/ossuary
# zfs create zroot/data/weechat
and mount points

Bash:
mkdir -p ~/Desktop
mkdir -p ~/documents
mkdir -p ~/downloads
mkdir -p ~/git
mkdir -p ~/.config
mkdir -p ~/.emacs.d
mkdir -p ~/.local
mkdir -p ~/.mozzila
mkdir -p ~/.ossuary
mkdir -p ~/.weechat
after i transfer the data i would set the zfs mount points and then mount them

Bash:
# zfs set mountpoint=/usr/home/djwilcox/Desktop zroot/data/desktop
# zfs set mountpoint=/usr/home/djwilcox/documents zroot/data/documents
# zfs set mountpoint=/usr/home/djwilcox/downloads zroot/data/downloads
# zfs set mountpoint=/usr/home/djwilcox/git zroot/data/git
# zfs set mountpoint=/usr/home/djwilcox/.config zroot/data/config
# zfs set mountpoint=/usr/home/djwilcox/.emacs.d zroot/data/emacsd
# zfs set mountpoint=/usr/home/djwilcox/.local zroot/data/local
# zfs set mountpoint=/usr/home/djwilcox/.mozilla zroot/data/mozilla
# zfs set mountpoint=/usr/home/djwilcox/.ossuary zroot/data/ossuary
# zfs set mountpoint=/usr/home/djwilcox/.weechat zroot/data/weechat
Heres how i created the zfs datasets on the external usb drive

list the disks

Bash:
geom disk list
switch to root

Bash:
doas su
wipe the drive which is /dev/da0

Bash:
gpart destroy -F da0
dd if=/dev/zero of=/dev/da0 bs=1m count=128
use gpart to create a gpt partition on the drive and add a label

Bash:
gpart create -s gpt da0
gpart add -t freebsd-zfs -l zbackup da0
create the mount point on my macbook air

Bash:
# mkdir -p /mnt/usb
create a new zpool and give it the same name as the gpt label to make things easy to remember set the mount point and use chown to change the owner of the mount point, replacing username:username with your username

create zfs pool on the external drive

Bash:
zpool create zbackup gpt/zbackup
zfs set mountpoint=/mnt/usb zbackup
chown username:username /mnt/usb
list zfs directory structure

Bash:
zfs list
create the snapshot

Code:
# zfs snapshot -r zroot@freebsd-12.1
send the snapshots to the corresponding pool on the drive use the -R option to create the datasets on the external drive

Bash:
# zfs send -Rv zroot@freebsd-12.1 | zfs receive -F zbackup/zroot
take a new snapshot to send the incremental snapshot

Bash:
zfs snapshot -r zroot@second-snapshot
send incremental snapshots use the -R option on the zroot pool to send incremental snapshots of the descendant file system

Bash:
# zfs send -Rv -I zroot@freebsd-12.1 zroot@second-snapshot | zfs recv -F zbackup/zroot
export the zfs backup before removing the drive

Bash:
# zfs export zbackup
 
Top