[CentOS] Problem with mdadm, raid1 and automatically adds any disk to raid

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.

Now every time I start fdisk to setup a new set of partitions I see in /var/log/messages as soon as I hit "W" in fdisk:

  Feb 25 15:38:32 webber systemd: Started Timer to wait for more drives before activating degraded array md2..
  Feb 25 15:38:32 webber systemd: Started Timer to wait for more drives before activating degraded array md1..
  Feb 25 15:38:32 webber systemd: Started Timer to wait for more drives before activating degraded array md0..
  Feb 25 15:38:32 webber kernel: md/raid1:md0: active with 1 out of 2 mirrors
  Feb 25 15:38:32 webber kernel: md0: detected capacity change from 0 to 5363466240
  Feb 25 15:39:02 webber systemd: Created slice system-mdadm\x2dlast\x2dresort.slice.
  Feb 25 15:39:02 webber systemd: Starting Activate md array md1 even though degraded...
  Feb 25 15:39:02 webber systemd: Starting Activate md array md2 even though degraded...
  Feb 25 15:39:02 webber kernel: md/raid1:md1: active with 0 out of 2 mirrors
  Feb 25 15:39:02 webber kernel: md1: failed to create bitmap (-5)
  Feb 25 15:39:02 webber mdadm: mdadm: failed to start array /dev/md/1: Input/output error
  Feb 25 15:39:02 webber systemd: mdadm-last-resort at md1.service: main process exited, code=exited, status=1/FAILURE

I check /proc/mdstat and sure enough, there it is trying to assemble an Array I DID NOT TOLD IT TO DO.

I do NOT WANT this to happen, it creates the same "SHIT" (the incorrect array) over and over again (systemd frustration).
So I tried to delete them again, wiped them again, killed processes, wiped disks.

No matter what I do as soon as I hit the "w" in fdisk systemd tries to assemble the array again without letting me to decide what to do.


Help!
Jobst



-- 
windoze 98: <n.> useless extension to a minor patch release for 32-bit extensions and a graphical shell for a 16-bit patch to an 8-bit operating system originally coded for a 4-bit microprocessor, written by a 2-bit company that can't stand for 1 bit of competition!

  | |0| |   Jobst Schmalenbach, General Manager
  | | |0|   Barrett & Sales Essentials
  |0|0|0|   +61 3 9533 0000, POBox 277, Caulfield South, 3162, Australia