Snapraid - Sync, scrub, diff setup instructions

Hi,

I have Snapraid configured on my NAS for a while, but I'm still not sure if it is set up the best way possible. My setup looks like this: 2 Data drives, 1 parity

Most of my data is media, so I have a scheduled "snapraid sync" job running once a week. This seems to work, but when I look in the snapraid log files, it never mentions the weekly sync. Only when I do it manually. Is that normal?

What about a "diff" or "scrub" job? Should I also do that every week or month? I hope someone can give me a few pointers on them.

Thanks a lot!

Zitat von jollyrogr

Best setup is whatever works for you. I run all my snapraid jobs manually so I know it won't sync when it shouldn't.

I always run snapraid diff to make sure a bunch of files aren't missing or got wiped out, then run the sync.

Then periodically run status and do a scrub if needed.

Others do it differently and it works for them.

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so you do a diff before you sync? I thought it makes sense to do it right after, so it's a confirmation about a successful sync. Does it interfere with a sync, if i watch eg. a movie while the sync is running?

Zitat von gderf

Don't sync without doing a diff first and understanding what it is telling you. Reading files from the array during SnapRAID operations is harmless. Adding files during a sync will generate warnings saying you shouldn't do that and suggest running the sync again.

There are several well written scripts available that perform SnapRAID operations in a recommended order. Most users will find that such a script will satisfy their needs. OMV comes bundled with one.

Ok thanks. Can you please point me to those scripts or show me where I can find the existing one within OMV. Thanks a lot

Zitat von gderf

In OMV's SnapRaid Settings see the Diff Script Settings section. To run it automatically in the scheduler, press the Schedules Diff button.

I do not use OMV's provided script or its scheduled command.

I use this script, I run it on cron @3:00am every fourth day:

Code

https://gist.github.com/mtompkins/91cf0b8be36064c237da3f39ff5cc49d

There are others out there.

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Thanks a lot. The script looks really nice and does what I want it to. I basically always want a sync every week, if files have changed.

I never called a script in the scheduled jobs. Could you help me out a little with the config please?

Lets say I save the script in "scripts/snapScript.sh" on my NAS. Do I have to call this exact command "scripts/snapScript.sh" ? Do I need to install something extra to send the mail or will it work when I enable the "send command output via mail" feature from the scheduled job wizard?

Thank you in advance!

ok, i figured it out "root/scripts/snapScript.sh" is the correct path

Zitat von AndrewZ

Is it possible to set something like that from OMV GUI? It should be */4 as a day, but I guess that is not available in the GUI.

just set "every n day" on 4 and you are good to go