Hi I have RAID1 system, the partition /dev/md4 is in raid1 with /dev/sda4 /dev/sdb4. In order to check /dev/sdb4 I remove it from /dev/md4 mdadm /dev/dm4 --fial /dev/sdb4 --remove /dev/sdb4 after checked it, I added it again mdadm /dev/md4 --add /dev/sdb4 The system did sync md4, this lasted ~ 6 hours. however, after reboot, /proc/mdstat shows /dev/md4 has one disk /dev/sda4 active. I have no choice, but add it again. the system do sync once again. apparent something is not right. How to let system hold both partitions /dev/sda4 and /dev/sdb4 for /dev/md4 after reboot? thanks Y -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines