Help and questions on Mergerfs, SnapRAID sync, scrub, diff

  • For the moment I am using OMV as backup for my desktop, laptop and other thing I have on the network using SybcBackFree that I run from my windows

    I have 2 identical drives installed for storage and was able to easily follow tutorials and install SnapRAID and mergerfs.

    I did that with the help of these tutorials:

    Setting up MergerFS SnapRaid and file server on OpenMediaVault
    In this video, I show how to setup a storage pool with drive failure protection using MergerFS and SnapRAID alongwith createing a file server with NFS and Sa...

    Setting up SnapRAID + mergerfs on OpenMediaVault... better than UnRAID for mixed drive sizes
    One correction that I need to make for this video for SnapRAID is that after adding the drives and settings you need to click the wrench/screwdriver icon in ...

    I do not clearly understand the difference and purpose for sync, scrub, diff the order and frequency they should run with - maybe someone can help explain for a noob in this area

    As settings I have now for SnapRAID:

    Scrub frequency 1

    Scrub percentage 5

    Update treshold 0

    Delete treshold 50

    One of the disks is set as data and the other as parity

    The first question/problem I have is that the automatically created Scheduled task, does not work. So I have no parity over the data I copied.

    This is the command of the automatically created Scheduled task:

    for conf in /etc/snapraid/omv-snapraid-*.conf; do /usr/sbin/omv-snapraid-diff ${conf}; done

    And when I run it, I get this error:

    How do I fix it? I have absolutely no idea what the issue is and how to se this up (and I'm too old to learn all this now :D)

    I have seen a recommendation on a different post to use this:

    I just need to set it up and forget about it...OR and this takes me to the second question:

    As alternative with which I would be more comfortable with, is to give up on the parity and just do regular back-ups somewhere else.

    In that case, would I still need need SnapRAID? From my understanding the answer is no, and it would be enough to se the file systems and create the pool

  • I suggest you read the SnapRAID manual to familiarize yourself with the program.


    Google is your friend and Bob's your uncle!

    OMV AMD64 7.x on headless Chenbro NR12000 1U 1x 8m Quad Core E3-1220 3.1GHz 32GB ECC RAM.

  • I suggest you read the SnapRAID manual to familiarize yourself with the program.

    I have but found nothing to help me figure out how to set that recurrent task. (which i see says diff and I also need sync) My linux knowledge if limited..

    Now after few more searches I realizes I had to run the first Sync manually (as written here) but that gave an error.

    I tried "Prehash+Sync" (no clue what this one does differently) but it worked, i let i running for a couple a minutes, then stopped it and after I saw the parity disk occupied as much as the data disk. What actually happened? No way it could have been copied that fast.

    Now I run again the Sync which this time works

Participate now!

Don’t have an account yet? Register yourself now and be a part of our community!