Question about the choice of file type

  • Hello,
    I come to you hoping to find the solution most suited to my needs.



    I have an HP DL380e server with 2xE5-2450L and 32 GB of ECC ram.I was thinking of going on a RAID5 mount in ext4.
    Following the advice of @cabrio_leo on other topics, I thought I was moving towards the ZFS format (32GB of ram that seems to be well suited), I was seduced by the possibilities and security that offers this format.



    Currently testing the possibilities of different formats and following the creation of a RAIDZ-1, I realized that it was not possible to enlarge a RAIDZ-1que by adding to the initial pool another RAIDZ-1 (so 3 disks minimum then again 3 discs etc ...).



    I want a solution that is at least as reliable as RAID5 and with the ability to add volumes without having to add them by 3 disks like ZFS.


    Is there currently a format compatible with OMV in the same genre as ZFS, but without the constraint of adding the disks by 3 as in the case of RAIDZ1?


    thank you in advance

  • I realized that it was not possible to enlarge a RAIDZ-1que by adding to the initial pool another RAIDZ-1 (so 3 disks minimum then again 3 discs etc ...).

    You can expand the pool not only by another RAIDZ-1 (in your case), but with any kind of ZFS volume.

    Is there currently a format compatible with OMV in the same genre as ZFS, but without the constraint of adding the disks by 3 as in the case of RAIDZ1?

    SnapRaid

    OMV 3.0.99 (Gray style)
    ASRock Rack C2550D4I C0-stepping - 16GB ECC - 6x WD RED 3TB (ZFS 2x3 Striped RaidZ1)- Fractal Design Node 304

  • You can expand the pool not only by another RAIDZ-1 (in your case), but with any kind of ZFS volume.

    SnapRaid


    My ultimate goal is to have 2 pools of 6-7 disks (in RAIDZ1 ideally). If I add a disk in another format than RAIDZ1, as a basic disk or a mirror, yes, it will be present, but not in RAIDZ1, is that it?
    If my request above is correct, you must at least add at least 3 disks for RAIDZ1.


    Regarding SnapRaid I will look at this thank you.


    Edit: Following the reading on the forum topic about snapraid and a very good comparative table, I think indeed that snapraid is the most flexible for the use I want to make. I was going to explore in this way. thanks again @cabrio_leo

  • If I add a disk in another format than RAIDZ1, as a basic disk or a mirror, yes, it will be present, but not in RAIDZ1, is that it?

    Yes. Then you have a pool consisting out of a RAIDZ1 and a mirror for example. ZFS volumes out of a single disk should be avoided because there is no data redundancy (It can be configured to have several copies of a file on a basic disk - but this is another story). E.g. if you add this kind of volume to a pool and this one-disk-volume fails you loose the complete pool.


    Regarding SnapRaid I will look at this thank you.

    SnapRaid is often used together with MergerFS.

    OMV 3.0.99 (Gray style)
    ASRock Rack C2550D4I C0-stepping - 16GB ECC - 6x WD RED 3TB (ZFS 2x3 Striped RaidZ1)- Fractal Design Node 304

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