Raid 0 grow

    Hi guys, I would like how to add more disks to an openmediavault running two 2TB disks in raid 0. I have more two 2TB disks and I would like to add those disks but without loose my data that had previously recorded in the 2 existent disks.
    Sorry about the bad english, I'm from Brazil.
    Hugs to all.

    Hi, well, the grow button is grey and it's not possible to do through the web interface, in the other hand, I tried to do using mdadm command line, no success...
    Other problem is that the amount of data recorded in the OMV is 2.8 TB and I have nothing with this size to move the data away and reconstruct the raid again with the new disks.
    I'm trying to find a way to grow the Raid 0, but seems that could be impossible...
    I'm stuck on this situation, any help will be welcome.
    Anyway, thanks for your interest.


    p.s.: Could you give me the sintax of mdadm command to try to grow, maybe I did something wrong ! I followed instructions on the mdadm man page !
    This what I have when I tried to do the grow:


    root@openmediavault:~# mdadm --add /dev/md127 /dev/sde
    mdadm: add new device failed for /dev/sde as 2: Invalid argument
    root@openmediavault:~#

    wow, did I read well? You are trying to expand a raid 0 but don't have any backup. It seems you like to live dangerously: one drive dies and so does the whole array... The odd of this happening with 3 drives being higher than with 2 drives.


    I don't know if mdadm allows to grow a raid 0 (I thought you wanted to grow a 2 drives raid 1 array to a 3 drives raid 5 array, which is possible with mdadm), but did you try the following command:
    mdadm --grow /dev/md127 --raid-devices=3 --add /dev/sde


    By the way, try this first in a VM as I won't be held responsible if it crashes your array. You've been warned.

    Hi Pollux,


    The entire OMV is running on a VM... I'm just testing the possibility to grow the raid 0. I have backup of all data, this is just a preparation for an action to be taken in a real machine that is running since the last year and now need to be grow.
    Anyway, thanks for the tip, I tested and this happened:


    root@openmediavault:~# mdadm --grow /dev/md127 --raid-devices=3 --add /dev/sde
    mdadm: --add cannot be used with other geometry changes in --grow mode
    root@openmediavault:~#


    That's it. But no problem, if it's not possible to grow a raid 0 we will dismantle the raid and use raid 5 when we add the two new more disks. I'm trying to make my life easy hehehe !

    Hummmmm, I see... Well, if it is not possible then I will go for the last option, dismantle everything and rebuild using Raid 5.
    Thanks for the help guys, I appreciate that !


    Hugs to all

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