Combinating RAID1 and normal storage possible?

  • Hi,


    I'd like to DIY build a 4 bay NAS running OMV to replace my readynas.


    Since I have a bunch of family photos that I don't want to lose, I would like to store them in a RAID1 with 2 disks.
    The less important things like movies and music, I'd like to store on a third disk with the possibility to add a second disk to increase storage.


    Is a combination possible and how can I set this up?


    I'm a newbie with limited linux experience, so don't get to technical on me.


    Thanks

  • I would like to store them in a RAID1 with 2 disks.

    Don´t forget to make a data backup also with RAID! Raid is for availability not for data security. Often some get more problems with "online" raid then without. Think about a solution with snapraid.

    OMV 3.0.100 (Gray style)

    ASRock Rack C2550D4I C0-stepping - 16GB ECC - 6x WD RED 3TB (ZFS 2x3 Striped RaidZ1) - Fractal Design Node 304 -

    3x WD80EMAZ Snapraid / MergerFS-pool via eSATA - 4-Bay ICYCube MB561U3S-4S with fan-mod

  • RAID is not for backup. It only allows you to keep on working when a drive fails, which is not a priority for most home users.
    RAID is a real-time mirror, so if something happens to your files (accidental deletion, corruption, malware, etc...) then it is instantly replicated to both drives.


    What you want is backup. This can be achieved with two disks, by replicating the content on a regular basis.


    Anyway, you can set up your storage any way you like in OMV.

  • RAID is a real-time mirror, so if something happens to your files (accidental deletion, corruption, malware, etc...) then it is instantly replicated to both drives.

    Just to add some more confusion and not trying to address what @hrc450 really wants (backup instead of RAID)...


    With btrfs' own RAID-1 mode and by creating snapshots automatically and running scrubs automatically the above threats ('accidental deletion, corruption, malware') can be addressed somehow. The RAID-1 mode combined with checksumming allows for self-healing in case data got corrupted on disk, the snapshots protect for 'software and user originated failure' and what many people don't know: btrfs' own RAID-1 mode allows to add a bunch of disks even of different size still only wasting half of the capacity for redundancy.


    Btrfs does things differently with RAID-1 and more than two disks compared to most if not all other mirror solutions. With btrfs at least two redundant copies of data are stored on at least two different disks. Use three 1TB disks, put a btrfs RAID-1 on it and you end up with double redundancy and 1.5 TB usable. Do this with the other mirror approaches and you end up with triple redundancy but only 1 TB usable.


    But obviously all of the above doesn't provide real data protection or any sort of prevention wrt hardware related failure. Simply set your NAS on fire and you know why. Two or more disks in the same enclosure might generate some redundancy but not sufficient redundancy when looking at the whole picture and wanting data protection. An off-site copy is needed for important data (easily done with modern attempts like btrfs since snapshots can be transferred in the lightest way possible with 'btrfs send|receive').


    Of course all of the above applies to ZFS too except the way mirroring is working with more than 2 disk devices.

  • I would use the old NAS as backup in a remote location (garage).


    I guess the best way to get the feel of working with OMV is to set up an old PC and work with it a bit.
    I guess I'm just a bit scared to make the jump and steer away from a of the shelf system like Synology.


    thanks

  • I would use the old NAS as backup in a remote location (garage)

    Very good idea but then you don't need to think about RAID-1 anyway? At least not when you wanted to use RAID to avoid data losses. :)


    I would walk my first steps not on really old hardware but better on a virtual machine these days (Virtualbox or the like) to get a feeling for OMV. It's not complicated anyway, just flash/install the image and then do everything via a browser.

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