Public bug reported:

The 4gb RPI4 is more than capable of handling zfs.
( Even zfs root can be enabled manually with arm64 eoan builds using a variant 
of the steps at https://github.com/zfsonlinux/zfs/wiki/Ubuntu-18.04-Root-on-ZFS 
. )

Currently one has to install zfs-dkms for zfs support, but ideally one
would have zfs modules come with the standard arm64 kernel so that one
does not have to recompile zfs on the pi.

Example:

uname -a
Linux rpi4 5.3.0-1011-raspi2 #12-Ubuntu SMP Fri Nov 1 09:07:06 UTC 2019 aarch64 
aarch64 aarch64 GNU/Linux
@rpi4:~$ zpool status
  pool: bpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(5) for details.
  scan: scrub repaired 0B in 0 days 00:00:00 with 0 errors on Mon Nov 11 
13:50:14 2019
config:

        NAME                                                      STATE     
READ WRITE CKSUM
        bpool                                                     ONLINE       
0     0     0
          usb-Samsung_Flash_Drive_FIT_0309318110004882-0:0-part3  ONLINE       
0     0     0

errors: No known data errors

  pool: rpool
 state: ONLINE
  scan: scrub repaired 0B in 0 days 00:01:21 with 0 errors on Mon Nov 11 
13:51:39 2019
config:

        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          sda4      ONLINE       0     0     0

errors: No known data errors

dkms status
zfs, 0.8.1, 5.3.0-1011-raspi2, aarch64: installed

@rpi4:~$ cat /proc/cpuinfo 
processor       : 0
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

processor       : 1
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

processor       : 2
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

processor       : 3
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

Hardware        : BCM2835
Revision        : c03111
Serial          : ---
Model           : Raspberry Pi 4 Model B Rev 1.1
@rpi4:~$ free -m
              total        used        free      shared  buff/cache   available
Mem:           3791         883        2612          18         295        2836
Swap:          4095           0        4095

** Affects: linux-raspi2 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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Packages, which is subscribed to linux-raspi2 in Ubuntu.
https://bugs.launchpad.net/bugs/1852119

Title:
  Please add zfs modules to linux-raspi2

Status in linux-raspi2 package in Ubuntu:
  New

Bug description:
  The 4gb RPI4 is more than capable of handling zfs.
  ( Even zfs root can be enabled manually with arm64 eoan builds using a 
variant of the steps at 
https://github.com/zfsonlinux/zfs/wiki/Ubuntu-18.04-Root-on-ZFS . )

  Currently one has to install zfs-dkms for zfs support, but ideally one
  would have zfs modules come with the standard arm64 kernel so that one
  does not have to recompile zfs on the pi.

  Example:

  uname -a
  Linux rpi4 5.3.0-1011-raspi2 #12-Ubuntu SMP Fri Nov 1 09:07:06 UTC 2019 
aarch64 aarch64 aarch64 GNU/Linux
  @rpi4:~$ zpool status
    pool: bpool
   state: ONLINE
  status: Some supported features are not enabled on the pool. The pool can
          still be used, but some features are unavailable.
  action: Enable all features using 'zpool upgrade'. Once this is done,
          the pool may no longer be accessible by software that does not support
          the features. See zpool-features(5) for details.
    scan: scrub repaired 0B in 0 days 00:00:00 with 0 errors on Mon Nov 11 
13:50:14 2019
  config:

          NAME                                                      STATE     
READ WRITE CKSUM
          bpool                                                     ONLINE      
 0     0     0
            usb-Samsung_Flash_Drive_FIT_0309318110004882-0:0-part3  ONLINE      
 0     0     0

  errors: No known data errors

    pool: rpool
   state: ONLINE
    scan: scrub repaired 0B in 0 days 00:01:21 with 0 errors on Mon Nov 11 
13:51:39 2019
  config:

          NAME        STATE     READ WRITE CKSUM
          rpool       ONLINE       0     0     0
            sda4      ONLINE       0     0     0

  errors: No known data errors

  dkms status
  zfs, 0.8.1, 5.3.0-1011-raspi2, aarch64: installed

  @rpi4:~$ cat /proc/cpuinfo 
  processor       : 0
  BogoMIPS        : 108.00
  Features        : fp asimd evtstrm crc32 cpuid
  CPU implementer : 0x41
  CPU architecture: 8
  CPU variant     : 0x0
  CPU part        : 0xd08
  CPU revision    : 3

  processor       : 1
  BogoMIPS        : 108.00
  Features        : fp asimd evtstrm crc32 cpuid
  CPU implementer : 0x41
  CPU architecture: 8
  CPU variant     : 0x0
  CPU part        : 0xd08
  CPU revision    : 3

  processor       : 2
  BogoMIPS        : 108.00
  Features        : fp asimd evtstrm crc32 cpuid
  CPU implementer : 0x41
  CPU architecture: 8
  CPU variant     : 0x0
  CPU part        : 0xd08
  CPU revision    : 3

  processor       : 3
  BogoMIPS        : 108.00
  Features        : fp asimd evtstrm crc32 cpuid
  CPU implementer : 0x41
  CPU architecture: 8
  CPU variant     : 0x0
  CPU part        : 0xd08
  CPU revision    : 3

  Hardware        : BCM2835
  Revision        : c03111
  Serial          : ---
  Model           : Raspberry Pi 4 Model B Rev 1.1
  @rpi4:~$ free -m
                total        used        free      shared  buff/cache   
available
  Mem:           3791         883        2612          18         295        
2836
  Swap:          4095           0        4095

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