[HowTo] SnapRAID in OMV

Do i understand correctly that normall you can not make an file system larger then the largest disk size, but when i make i "enable pool" in the plugin it is seen as 1 file system? I have and directory larger then my biggest disk and would like to keep it that way.

Ok thanks for your answer. I keep it with raid5 then!

Hey Guys,

I've just installed SnapRAID and it's running well. (3 Disks with 1 Parity, Content on every Disk)

Now I want to setup a Cron-Job to sync automatically the Data but I'm a little bit confused.
I've read this Thread almost 3-times but I don't get it exactly.

What is the need for "Scrub"?

I just wanna:
- Sync every x days
- Scrub? (Is there a need for a script? Isn't it running almost autmatically every 7days by default? (Diff Script settings in Plugin-Settings)
- Diff? (Why should I need a list of the changed files?)
- maybe a Status / Notification

Is the script "omv-snapraid-diff" located in /usr/local/bin all I need therefore?
Is there any need to customize this script or will it run "out of the box"?

At least another question:
I have 2 Data-Disks, one with 2TB, one of 3TB. Parity-Drive has 4TB.
If I wanna swap the 2TB disk for an 4TB disk, will I handle it the same way as the 2TB disk is defective?

Thank you very much!

Okay, thanks.
I think I got it now almost.

Zitat von Solo0815

Notification per mail? It is already there. Please explain more detailed.

Yes, Notification per mail. Sorry for being unexactly.
For a detailed explanation, or "wish" I have to get an Notification an see whats in there first.

Thanks!

Okay, I think I have to start new with SnapRAID.

To have a look how it works I copied some new files on my Datadisk, startet manually "Diff" and then a "Sync".
Sync always stucked, even kill-command can't stop the process. I've let it run the whole night but nothing happend.

It seems that the Filesystem of the Parity-Disk is broken, at least OMV is telling me during startup.
The Parity-Disk is a new 4TB WD Disk which was formatted as ext4 as I setup SnapRAID.
So I'm sure the disk is not defective.

I'll have to take a look for the cause of this.

Now I wanna setup SnapRAID completely new and have a question about pooling.
The SnapRAID Manual says: The Paritydisk has to be at least the same size as the biggest Datadisk, or bigger.
I read in this Thread: The Paritydisk has to be at least the same size as the biggest Filesystem, or bigger.

Whats right? If I do pooling, the biggest Filesystem would be 7TB (4TB+3TB) so the Paritydisk can't be same size or bigger.
The biggest Datadisk would be 4TB, so a 4TB Paritydisk would fit.

I wanna pool with Unionfilesystem, using "aufs".

What do you think? Whats right?

Thanks.

Thanks a lot for your help.

One Datadisk is nearly full (80-85%, the 3TB one) so maybe that caused the Filesystem-Error on my Paritydisk? (Paritydisk was ca. 50% filled only)??
No idea and I don't think so, but because the 3TB disk was nearly full I decided to pool with the 4TB disk to have enough space in future.

I will buy another 4TB disk for parity and will give it another try. I'm sure I will come back to this Thread when the disk is here

Thanks!

Hi Guys,

Been a long time user of Freenas, Shifting to OMV - Snapraid this week, so doing my homework on the same.

Wanted to know the following :-
1. Any reason why snap raid is not updated to the latest in omv extra's plugin? its still in 6.3. Is it ok if i use the compiled version of snap raid ? Would i be allowed to apply updated further down the line from the plugin?
2. Is there any documentation on what snapraid sync and fix do? Because there are contradicting information on what to do if the parity disk fails..
3. Is there any way i can mount a ZFS pool in omv, i understand that freenas 9.3 is too new for the plugin to work, wanted to transfer my data from the 3X 1TB disk to 2x 4TB disks.
4. I see that after changing a disk incase of failure and doing a sync again gives me an error.. I have to try sync and fix through terminal for it to work.

Hopefully i didnt ask any dumb questions, if so please forgive me; am new to the system

Thanks for the fast response.

Great, so i can use the compiled version and then upgrade the snap raid plugin when available right?. I am favouring the new version as it is also reporting smart Data. I found that once the parity is made through new version of snap raid its not possible to go back without removing parity, which is a risk. Is there any ppa available for snap raid as well?

Regarding the 4th point, that after changing the disk, sync and fix don't work from gui, am i doing something wrong ? it asks me to first do snap raid fix -e, is there anyway to automate this?

And do you think its possible to remove the disks added through Snapraid ui to re-appear when adding another disk? (Sorry if am confusing you )

By the way, Great Job on the Snapraid Plugin team..

Oh Thanks a lot.

To be frank am really scared of shifting all my content to EXT4 + Snapraid + OVM.. I have been experimenting with it since few days on VM to try and get accustomed to it before the shift.

I wanted to go from Mirror to Raid 6 to Raid 5 as i keep buying more hardisks, and it seems Snapraid is the only one which allows me to do so.

Hi there

I just updated SnapRAID via "plugins" from 6.3 to 7.0.

The SnapRAID Information-Tab still says "Version 6.3 by Andrea Mazzoleni, http://snapraid.sourceforge.net" - is this correct or did the upgrade go wrong?

thx and cheers

I bet is correct. He only forgot to change the info.
To be sure, youu can enter cli and see the output for:

Zitat

apt-cache policy snapraid

no worries, thx for the reply