In article <20190225050144.GA5984@xxxxxxxxxxxxxxxxxxxxx>,
Jobst Schmalenbach <jobst@xxxxxxxxxxxxxx> wrote:
> Hi.
>
> CENTOS 7.6.1810, fresh install - use this as a base to create/upgrade new/old machines.
>
> I was trying to setup two disks as a RAID1 array, using these lines
>
> mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sdb1 /dev/sdc1
> mdadm --create --verbose /dev/md1 --level=0 --raid-devices=2 /dev/sdb2 /dev/sdc2
> mdadm --create --verbose /dev/md2 --level=0 --raid-devices=2 /dev/sdb3 /dev/sdc3
>
> then I did a lsblk and realized that I used --level=0 instead of --level=1 (spelling mistake)
> The SIZE was reported double as I created a striped set by mistake, yet I wanted the mirrored.
>
> Here starts my problem, I cannot get rid of the /dev/mdX no matter what I do (try to do).
>
> I tried to delete the MDX, I removed the disks by failing them, then removing each array md0, md1 and md2.
> I also did
>
> dd if=/dev/zero of=/dev/sdX bs=512 seek=$(($(blockdev --getsz /dev/sdX)-1024)) count=1024
> dd if=/dev/zero of=/dev/sdX bs=512 count=1024
> mdadm --zero-superblock /dev/sdX
>
> Then I wiped each partition of the drives using fdisk.
The superblock is a property of each partition, not just of the whole disk.
So I believe you need to do:
mdadm --zero-superblock /dev/sdb1
mdadm --zero-superblock /dev/sdb2
mdadm --zero-superblock /dev/sdb3
mdadm --zero-superblock /dev/sdc1
mdadm --zero-superblock /dev/sdc2
mdadm --zero-superblock /dev/sdc3
Cheers
Tony
--
Tony Mountifield
Work: tony@xxxxxxxxxxxxx - http://www.softins.co.uk
Play: tony@xxxxxxxxxxxxxxx - http://tony.mountifield.org
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