OMV 6 with ZFS: Good idea?

I have some experience with OMV 4 and 5.

Now I want to install a completely new NAS mith OMV6, using ZFS-1 (RAID 5).

Now I have some questions:

-is 8GB RAM enough with a Intel I7 CPU?

-can I start with just one ore two hdds and ZFS (without RAID) and later change to ZFS-1 without loosing data

Thanks a lot for helping.

Quote from ryecoaaron

Any reason why you need raid?

Just for not loosing my data if one disk fails in the RAID.

Quote from ryecoaaron

And what if ransomware hit your system? raid isn't backup. You would be better off to backup one drive to another.

I know. My important files are backed up on another NAS, USB-HDD and enrypted in the cloud

Am I correct that ZFS without RAID pools hdds and in case of a hardware failure only the files of this defective hdd are lost?

With ZFS-Z1 this won't happen because one hdd can fail without loosing data.

Thanks chente.

So what are the advantages/pro's of ZFS for home-use over the other more convenient filesystems OMV offers?

Are there any to take in account?

Quote from chente

In my opinion any kind of Raid is not necessary for a standard home system.

If the information is valuable and is going to be stored for a long time, perhaps avoiding bitrot could be the only reason. For that you can use ZFS, BTRFS or snapraid.

So ZFS, BTRFS or SnapRaid without RAID will avoid bitrot?

Very interesting perspective and without RAID not all hdds need to spin up (?).

Quote from chente

When did I say that?

You need parity to avoid bitrot, therefore you need some kind of Raid.

Now we're in sync again, thanks.

Back again to mergerfs: When I want to have just one share spaning over for example 3 hdds then I should use mergerfs.

Am I right that if one of these 3 hdds fails just the files from this one hdd are lost/missing in the share but access to the remaining files/hdds is possible without problems?

If I later change my mind and want a RAID-5 there ist no solution to add an additional disk and keep the data of my 3-hdd-share?

Thanks a lot. I'll give SnapRAID a try.

I configured OMV 6.3.12 with mergerfs successfully but got a lot of "connection Lost" errors.

Is this a well known behaviour of OMV 6 or what else could be the problem?
Never had any problems in my 1GB-home-Network.

The hdds are from a older NAS-system.

A USB3-Stick is used for OMV6.

When creating mergerfs I get:

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; export LANGUAGE=; omv-salt deploy run --no-color mergerfs 2>&1' with exit code '1': debian:

----------

ID: configure_pool_dir

Function: file.directory

Name: /srv/mergerfs

Result: True

Comment: The directory /srv/mergerfs is in the correct state

Started: 12:14:06.401157

Duration: 3.953 ms

Changes:

----------

ID: remove_mergerfs_mount_files_/etc/systemd/system

Function: module.run

Result: True

Comment: file.find: ['/etc/systemd/system/srv-mergerfs-MERGER\\x2d01.mount']

Started: 12:14:06.405531

Duration: 2.032 ms

Changes:

----------

file.find:

- /etc/systemd/system/srv-mergerfs-MERGER\x2d01.mount

----------

ID: systemd_remove_dead_symlinks

Function: cmd.run

Name: find /etc/systemd/system/multi-user.target.wants -xtype l -print -delete

Result: True

Comment: Command "find /etc/systemd/system/multi-user.target.wants -xtype l -print -delete" run

Started: 12:14:06.407967

Duration: 4.288 ms

Changes:

----------

pid:

6299

retcode:

0

stderr:

stdout:

/etc/systemd/system/multi-user.target.wants/srv-mergerfs-MERGER\x2d01.mount

----------

ID: configure_mergerfs_MERGER-01

Function: file.managed

Name: /etc/systemd/system/srv-mergerfs-MERGER\x2d01.mount

Result: True

Comment: File /etc/systemd/system/srv-mergerfs-MERGER\x2d01.mount updated

Started: 12:14:06.412440

Duration: 37.136 ms

Changes:

----------

diff:

New file

mode:

0644

----------

ID: systemd-reload_MERGER-01

Function: cmd.run

Name: systemctl daemon-reload

Result: True

Comment: Command "systemctl daemon-reload" run

Started: 12:14:06.449722

Duration: 163.649 ms

Changes:

----------

pid:

6306

retcode:

0

stderr:

stdout:

----------

ID: enable_MERGER-01_mergerfs

Function: service.enabled

Name: srv-mergerfs-MERGER\x2d01.mount

Result: True

Comment: Service srv-mergerfs-MERGER\x2d01.mount has been enabled, and is in the desired state

Started: 12:14:06.632960

Duration: 327.67 ms

Changes:

----------

srv-mergerfs-MERGER\x2d01.mount:

True

----------

ID: restart_MERGER-01_mergerfs

Function: cmd.run

Name: systemctl restart srv-mergerfs-MERGER\x2d01.mount

Result: False

Comment: Command "systemctl restart srv-mergerfs-MERGER\x2d01.mount" run

Started: 12:14:06.960897

Duration: 7.615 ms

Changes:

----------

pid:

6356

retcode:

5

stderr:

Failed to restart srv-mergerfs-MERGERx2d01.mount: Unit srv-mergerfs-MERGERx2d01.mount not found.

stdout:

Summary for debian

------------

Succeeded: 6 (changed=6)

Failed: 1

------------

Total states run: 7

Total run time: 546.343 ms

OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; export LANGUAGE=; omv-salt deploy run --no-color mergerfs 2>&1' with exit code '1': debian:

----------

ID: configure_pool_dir

Function: file.directory

Name: /srv/mergerfs

Result: True

Comment: The directory /srv/mergerfs is in the correct state

Started: 12:14:06.401157

Duration: 3.953 ms

Changes:

----------

ID: remove_mergerfs_mount_files_/etc/systemd/system

Function: module.run

Result: True

Comment: file.find: ['/etc/systemd/system/srv-mergerfs-MERGER\\x2d01.mount']

Started: 12:14:06.405531

Duration: 2.032 ms

Changes:

----------

file.find:

- /etc/systemd/system/srv-mergerfs-MERGER\x2d01.mount

----------

ID: systemd_remove_dead_symlinks

Function: cmd.run

Name: find /etc/systemd/system/multi-user.target.wants -xtype l -print -delete

Result: True

Comment: Command "find /etc/systemd/system/multi-user.target.wants -xtype l -print -delete" run

Started: 12:14:06.407967

Duration: 4.288 ms

Changes:

----------

pid:

6299

retcode:

0

stderr:

stdout:

/etc/systemd/system/multi-user.target.wants/srv-mergerfs-MERGER\x2d01.mount

----------

ID: configure_mergerfs_MERGER-01

Function: file.managed

Name: /etc/systemd/system/srv-mergerfs-MERGER\x2d01.mount

Result: True

Comment: File /etc/systemd/system/srv-mergerfs-MERGER\x2d01.mount updated

Started: 12:14:06.412440

Duration: 37.136 ms

Changes:

----------

diff:

New file

mode:

0644

----------

ID: systemd-reload_MERGER-01

Function: cmd.run

Name: systemctl daemon-reload

Result: True

Comment: Command "systemctl daemon-reload" run

Started: 12:14:06.449722

Duration: 163.649 ms

Changes:

----------

pid:

6306

retcode:

0

stderr:

stdout:

----------

ID: enable_MERGER-01_mergerfs

Function: service.enabled

Name: srv-mergerfs-MERGER\x2d01.mount

Result: True

Comment: Service srv-mergerfs-MERGER\x2d01.mount has been enabled, and is in the desired state

Started: 12:14:06.632960

Duration: 327.67 ms

Changes:

----------

srv-mergerfs-MERGER\x2d01.mount:

True

----------

ID: restart_MERGER-01_mergerfs

Function: cmd.run

Name: systemctl restart srv-mergerfs-MERGER\x2d01.mount

Result: False

Comment: Command "systemctl restart srv-mergerfs-MERGER\x2d01.mount" run

Started: 12:14:06.960897

Duration: 7.615 ms

Changes:

----------

pid:

6356

retcode:

5

stderr:

Failed to restart srv-mergerfs-MERGERx2d01.mount: Unit srv-mergerfs-MERGERx2d01.mount not found.

stdout:

Summary for debian

------------

Succeeded: 6 (changed=6)

Failed: 1

------------

Total states run: 7

Total run time: 546.343 ms in /usr/share/php/openmediavault/system/process.inc:197

Stack trace:

#0 /usr/share/php/openmediavault/engine/module/serviceabstract.inc(62): OMV\System\Process->execute()

#1 /usr/share/openmediavault/engined/rpc/config.inc(170): OMV\Engine\Module\ServiceAbstract->deploy()

#2 [internal function]: Engined\Rpc\Config->applyChanges(Array, Array)

#3 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)

#4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(149): OMV\Rpc\ServiceAbstract->callMethod('applyChanges', Array, Array)

#5 /usr/share/php/openmediavault/rpc/serviceabstract.inc(588): OMV\Rpc\ServiceAbstract->OMV\Rpc\{closure}('/tmp/bgstatushx...', '/tmp/bgoutputaH...')

#6 /usr/share/php/openmediavault/rpc/serviceabstract.inc(159): OMV\Rpc\ServiceAbstract->execBgProc(Object(Closure))

#7 /usr/share/openmediavault/engined/rpc/config.inc(192): OMV\Rpc\ServiceAbstract->callMethodBg('applyChanges', Array, Array)

#8 [internal function]: Engined\Rpc\Config->applyChangesBg(Array, Array)

#9 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)

#10 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('applyChangesBg', Array, Array)

#11 /usr/sbin/omv-engined(537): OMV\Rpc\Rpc::call('Config', 'applyChangesBg', Array, Array, 1)

#12 {main}