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ubuntu and raid0

I lsblk and get:

root@ubuntu:/home/ubuntu/Desktop# lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
loop0         7:0    0   1.6G  1 loop /rofs
loop1         7:1    0   471M  1 loop
loop2         7:2    0 874.4M  1 loop
loop3         7:3    0 269.8M  1 loop /snap/firefox/4793
loop4         7:4    0  74.3M  1 loop /snap/core22/1564
loop5         7:5    0     4K  1 loop /snap/bare/5
loop6         7:6    0 505.1M  1 loop /snap/gnome-42-2204/176
loop7         7:7    0  10.7M  1 loop /snap/firmware-updater/127
loop8         7:8    0  91.7M  1 loop /snap/gtk-common-themes/1535
loop9         7:9    0  10.5M  1 loop /snap/snap-store/1173
loop10        7:10   0 149.6M  1 loop /snap/thunderbird/507
loop11        7:11   0 116.8M  1 loop /snap/ubuntu-desktop-bootstrap/237
loop12        7:12   0  38.8M  1 loop /snap/snapd/21759
loop13        7:13   0   500K  1 loop /snap/snapd-desktop-integration/178
loop14        7:14   0 752.9M  1 loop /snap/pycharm-community/439
nvme1n1     259:0    0   1.9T  0 disk
├─nvme1n1p1 259:1    0   300M  0 part
└─nvme1n1p2 259:2    0   1.9T  0 part
nvme0n1     259:3    0   1.8T  0 disk

tried:

root@ubuntu:/home/ubuntu/Desktop# sudo mdadm --create --verbose /dev/nvme0n1 /dev/nvme1n1
mdadm: Value "/dev/nvme0n1" cannot be set as devname. Reason: Not POSIX compatible.


help please?