OMV neue Festplatte

  • Hallo zusammen,

    habe mal eine Frage?

    Aktuell habe ich einen OMV mit 5.5.19-1 am laufen

    Istalliert sind 4 Festplatten Western Digita WD40EFRX mit je 4TB

    Die Festplatten laufen mit Raid 10 Kapazität 7,28 TB

    Aktuell sind 4,96 TB belegt.

    Meine Frage wäre wenn ich eines Tage eine neue größer Festplatte zb 6 TB

    kann ich sie einfach tauschen oder wie genau geht das??

    In einem anderen Forum wurde mir geraten alles extern zu sichern und auf Raid 5 umstellen

    Wenn das Raid sichern möchte wie genau geht das und ich brauche eine externe PLatte mit min 5 TB oder?

    Grus Tom

  • My question would be if I had a new larger hard drive one day, eg 6 TB can I just swap them or how exactly does that work

    No, as the data is striped across 2 mirrored raids the capacity is determined by the smallest drive within the array, so to increase capacity you have change all four drives.


    The suggestion of using Raid 5, with your current drive sizes would increase your usable storage capacity to 12TB, there is Raid calculator here

    Raid is not a backup! Would you go skydiving without a parachute?

  • Correct, it is bare minimum but points to the site with advanced usage https://raid.wiki.kernel.org/index.php/A_guide_to_mdadm

    describing the necessary details like:


    hence I'd disagree with the blunt statement "as helpful as a chocolate teapot,"

    omv 5.6.12-1 (usul) on RPi4/4GB with Kernel 5.10.17 and WittyPi 3 V2 RTC HAT

    2x 6TB HDD formatted with ext4 in Icy Box IB-RD3662-C31 / hardware supported RAID1

    For Read/Write performance of SMB shares hosted on this hardware see forum here

  • B) probably neither does the wiki

    I'd appreciate if you could verify this statement, I've opened Issue #943 in GH to improve the RAID related doc

    omv 5.6.12-1 (usul) on RPi4/4GB with Kernel 5.10.17 and WittyPi 3 V2 RTC HAT

    2x 6TB HDD formatted with ext4 in Icy Box IB-RD3662-C31 / hardware supported RAID1

    For Read/Write performance of SMB shares hosted on this hardware see forum here

  • to improve the RAID related doc

    Actually FYI I was asked to do this, but creating a Raid doc or addendum is simply not feasible, scenarios are just too great to calculate and this is a classic case in point


    You are obviously not technically minded , the OP to whom I most sincerely apologise, requested some simple relevant information which I have hopefully given, not directed him to the docs and then onto a wiki, this forum does not work like this.

    Raid is not a backup! Would you go skydiving without a parachute?

  • Thanks for all the positive feedback.

    The differences in our approaches to respond seem to be, that I first try to confirm assumptions before I jump on a conclusion.

    This is because I learned the hard way that "assumptions" specifically the ones never spelled out, at the end account for success or failure of any activity.

    omv 5.6.12-1 (usul) on RPi4/4GB with Kernel 5.10.17 and WittyPi 3 V2 RTC HAT

    2x 6TB HDD formatted with ext4 in Icy Box IB-RD3662-C31 / hardware supported RAID1

    For Read/Write performance of SMB shares hosted on this hardware see forum here

  • creating a Raid doc or addendum is simply not feasible

    Well maybe again we different assumption, but my IT support experience tells me that 80/20 rules apply.

    Documenting 80% of all possible scenarios is good enough and helps to answer at least 80% of all questions.

    Great documentation already achieves 95%!


    Only the remaining 20% are well spent time to be answered in a forum, the other 80% are handled by good enough documentation.

    80% of users having an issue are happy to solve it themselves by reading documentation and applying the solution without further assistance.

    omv 5.6.12-1 (usul) on RPi4/4GB with Kernel 5.10.17 and WittyPi 3 V2 RTC HAT

    2x 6TB HDD formatted with ext4 in Icy Box IB-RD3662-C31 / hardware supported RAID1

    For Read/Write performance of SMB shares hosted on this hardware see forum here

  • You have a RAID 10, which means 2 x RAID 1 with 2 disks of 4 GB each. The 2 x RAID 1 are combined to 1 x RAID 0 with 8 TB. When a disk is replaced in your RAID 1 array, the disk must be at least 4GB in size for the RAID 1 mirror to be restored, the RAID 1 of 4GB cannot be smaller. A larger disk (6TB) than 4 TB can be installed in RAID 1, but the RAID 1 will be restored with 4 TB.


    The following applies to a RAID 1 WITHOUT RAID 0 array. If you want to bring the RAID 1 array to the new disk size of 6 TB, you have to install a second disk with 6 TB. Procedure: Replace one disk with a larger one, rebuild the RAID 1 array, dissolve the RAID 1 array, adjust the partitions, rebuild the RAID 1 array with the second large disk. That's it. With RAID 0 this procedure is not possible, because as soon as a side/disk of RAID 0 is defective or is removed, the RAID 0 is bricked. In your case: data backup of the 8TB from RAID 0, break up RAIDs, create RAIDs with 4 bigger disks and restare the data. That's the theory.


    Practically: Save the data from the RAID 0 to another media, break up the RAID 0 array and create a RAID 5 with the 4 disks, restore the data to the RAID 5, thus turning the 8TB into 12TB of disk space.

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