Adding a Raid after setup...and it dissapears after reboot

[amnz]

Hi,

I'm trying to add a new Raid1 volume to a new installation on a dedicated server at Hetzner.
First we install Proxmox using the two main NvME disks in a Raid1 config with no trouble on it.
After boot, update, etc, we want to create a new Raid1 for the two extra SSD disks.

So we did it:
mdadm --create --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sda /dev/sdb

after that ckeck it is creating the raid with:
cat /proc/mdstat

and format device with:
mkfs.ext4 /dev/md2

also mount device:
mkdir /DataVolume
mount /dev/md2 /DataVolume

We added new raid info at /etc/mdadm/mdadm.com with:
mdadm --examine --scan --config=mdadm.conf >> /etc/mdadm/mdadm.conf

All Ok...but when rebooting. md2 dissapeared... there is no md2 at all

any ideas? Thanks

 

[tom]

Please note:

https://pve.proxmox.com/wiki/Software_RAID

 

[amnz]

Well.
Just found solution, and why, here:
ht t tp s://unix.stackexchange.com/a/483362