vielen Dank
habe es so gemacht:
root@DS720:~# mdadm --stop /dev/md3
mdadm: stopped /dev/md3
root@DS720:~# mdadm --zero-superblock /dev/nvme0n1p3
root@DS720:~# mdadm --zero-superblock /dev/nvme1n1p3
root@DS720:~# fdisk -l /dev/nvme0n1
Disk /dev/nvme0n1: 1.8 TiB, 1920383410176 bytes, 3750748848 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6a83ba10
Device Boot Start End Sectors Size Id Type
/dev/nvme0n1p1 256 4980735 4980480 2.4G fd Linux raid autodetect
root@DS720:~# fdisk -l /dev/nvme1n1
Disk /dev/nvme1n1: 1.8 TiB, 1920383410176 bytes, 3750748848 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x437a264d
Device Boot Start End Sectors Size Id Type
/dev/nvme1n1p1 256 4980735 4980480 2.4G fd Linux raid autodetect
root@DS720:~# mdadm --create /dev/md3 --level=0 --raid-devices=3 --force /dev/nvme0n1p3 /dev/nvme1n1p3 /dev/sata2p5
mdadm: cannot open /dev/sata2p5: No such file or directory
Device Boot Start End Sectors Size Id Type
/dev/nvme1n1p1 256 4980735 4980480 2.4G fd Linux raid autodetect
root@DS720:~# mdadm --create /dev/md3 --level=0 --raid-devices=3 --force /dev/nvme0n1p3 /dev/nvme1n1p3 /dev/sata2p5
mdadm: cannot open /dev/sata2p5: No such file or directory
komme leider nicht weiter.