move /home to ZFS pool

[nitin chandra]

Hi,

>From the clue given by Richard, this is what I did :-

1. Cleaned the default user 'adminsys'. moved the hidden file to /opt

2. created data set

# zfs create -o mountpoint=/home homedata/home

# zfs list
NAME               USED  AVAIL  REFER  MOUNTPOINT
mapsetsdata        480K   837G    96K  /mapsetsdata
mapsetsdata/home    96K   837G    96K  /home


# cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda1 during installation
UUID=d3a4cbac-4033-414d-bbee-c5e33547e0f8 /               btrfs
defaults,subvol=@ 0       1
# /home was on /dev/sda1 during installation
UUID=d3a4cbac-4033-414d-bbee-c5e33547e0f8 /home           btrfs
defaults,subvol=@home 0       2
# swap was on /dev/sda5 during installation
UUID=07b33f4c-5bef-4a99-8678-2c66d1574f0b none            swap    sw
           0       0
## setting ZFS
# /homedata/home    /home  zfs  defaults,noatime  0  2

# df -h
Filesystem        Size  Used Avail Use% Mounted on
udev              5.8G     0  5.8G   0% /dev
tmpfs             1.2G  9.0M  1.2G   1% /run
/dev/sda1          28G  2.5G   24G  10% /
tmpfs             5.8G  4.0K  5.8G   1% /dev/shm
tmpfs             5.0M     0  5.0M   0% /run/lock
tmpfs             5.8G     0  5.8G   0% /sys/fs/cgroup
homedata/home  837G  128K  837G   1% /home
homedata       837G  128K  837G   1% /homedata
cgmfs             100K     0  100K   0% /run/cgmanager/fs
tmpfs             1.2G     0  1.2G   0% /run/user/1000


Which FS will be used, as in fstab /home says btrfs and zfs points to
homedata/home and /home also shows /home size as ZFS pool size ?

Can I add more disk's to this pool ?

copied the 'adminsys'


Still No luck

Suggestion please ...

Thank you

On 14 October 2017 at 12:42, nitin chandra <nitinchandra1 at gmail.com> wrote:
> Hi All,
>
>
> I have ZFS installed on Ubuntu 16.04 with kernel-4.4.0-96 and zfs from
> repositories.
> (zfs from repositories was not getting installed with kernel 4.10 or 4.12)
>
> # sudo apt install spl dkms spl-dkms zfsutils-linux zfs-dkms zfs-doc
> zfs-initramfs zfs-zed
>
> # sudo zpool create -o ashift=12 -o autoexpand=on -o autoreplace=on -O
> atime=off -O compression=lz4 homedata
> ata-WDC_WD10EZEX-08WN4A0_WD-WCC6Y3HCDZU2-part3
>
> # sudo zfs create homedata/home
>
> # sudo zfs set mountpoint=legacy homedata/home
>
> ## edit in '/etc/fstab'
> homedata/home   /home   zfs   defaults,noatime  0  0
>
> I have 2 Admin accounts, adminsys (main) and admin2(temp).
>
> When I reboot the move of /home does not happen.
>
> I have been at this for past 4 days, I am sure I am missing some thing
> very simple.
>
> Some information about the current status :
>
>
> adminsys at home01:~$ sudo zfs list
> [sudo] password for adminsys:
> NAME          USED  AVAIL  REFER  MOUNTPOINT
> homedata   308K   837G   116K  /homedata
>
>
> adminsys at home01:~$ sudo zpool status
>   pool: homedata
>  state: ONLINE
>   scan: scrub repaired 0 in 0h0m with 0 errors on Fri Oct 13 15:23:11 2017
> config:
>
> NAME                                              STATE     READ WRITE CKSUM
> homedata                                       ONLINE       0     0     0
>  ata-WDC_WD10EZEX-08WN4A0_WD-WCC6Y3HCDZU2-part3  ONLINE       0     0     0
>
> errors: No known data errors
> adminsys at home01:~$
>
>
> I intend to use this pool to share on LAN with a mix of Win 7/8/10 and
> Linux machines.
>
> Need help in setting up
>
> 1. pool as /home
> 2. 'pool' '/home' on LAN (smb) with 4 users
>
>
> Default users are created when installing Ubuntu at the time of
> install .. 'adminsys', later ... after researching on the net
> somewhere it was
> suggested create 2nd 'root' user to move the main 'root' user ...
> adminsys to the ZFS pool.
>
> so /home directory is not empty.
>
> tried the following in /etc/fstab
>
> homedata/home    /home   zfs    defaults,noatime    0     0
>
> still nope :(
>
> So if I login with 2nd root account,
>
> empty the 1st root directory, erasing even the hidden files. Leave the
> main directory.
>
> then do
>
> [root at homedata]# zfs set mountpoint=legacy homedata/home
>
> then modify 'fstab' as above, will it work ?
>
> If I dont do any modifications to 'fstab' then, Yes, it does mount
> 'homedata' pool on boot. I can
>
> cd /homedata <enter>
>
> [adminsys at home01:/homedata] #
>
>
> Thank you
>
> Nitin