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    SubjectRe: Raid 10 question/problem [ot]
    Jan Engelhardt wrote:
    > On Jan 27 2007 10:31, Marc Perkel wrote:
    []
    >> Sorry about that. I'm using Fedora Core 6. /dev/md0
    >> and /dev/md1, buth of which are raid 1 arrays survive
    >> the reboot. But when I make a raid 0 out of those two
    >> raid arrays that's what is vanishing.
    >
    > That's interesting. I am using Aurora Corona, and all but md0 vanishes.
    > (Reason for that is that udev does not create the nodes md1-md31 on
    > boot, so mdadm cannot assemble the arrays.)

    This is nonsense.

    Mdadm creates those nodes automa[tg]ically - man mdadm, search for --auto.
    Udev has exactly nothing to do with mdX nodes.

    In order for an md array to be started up on boot, it has to be specified
    in /etc/mdadm.conf. With proper DEVICE line in there. That's all.

    If you're using raid0 on top of two raid1s (as opposed to using raid10
    directly - which is more efficient and flexible), the DEVICE line in
    mdadm.conf should be either `partitions' (usually preferred way), or -
    in case direct device list is specified - should contain both real
    disks AND the raid1 arrays.

    But in any case, this has exactly nothing to do with kernel.
    It's 100% userspace issues, I'd say distribution-specific issues.

    /mjt
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