Scope: I have two discs with 4 TB. One is used as home. I wish to run home on a RAID1. But I have no means to do a backup of all data. Solution: trying to create a "broken" RAID1 with mdadm on sdb1 and copy over the data. Mount the RAID 1 as /home to see if all works. Format sda1 (current /home) and join then the disk to the RAID1. Currently I am stuck already at the first step: With reference to: https://unix.stackexchange.com/questions/63928/can-i-create-a-software-raid-... I tried the proposed solution. The RAID1 should be EXT4. So: mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sdb1 missing mkfs -text4 /dev/md0 But, when I try I get a (for me) surprising response from mdadm: mdadm: option -t not valid in create mode I am not aware that I am using an option -t in the command. So it is possible that I am commiting a syntax error. Can anybody help me out about what I am doing wrong? (All this is of course in su -) P.S. I tried with: no partition, partition sdb1 not formatted, partition sdb1 formatted already in EXT4. The answer is always the same. "option -t not valid in create mode". _________________________________________________________________ ________________________________________________________ Ihre E-Mail-Postf�cher sicher & zentral an einem Ort. Jetzt wechseln und alte E-Mail-Adresse mitnehmen! https://www.eclipso.de -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org