On Fri, Jul 3, 2009 at 9:15 PM, Steven Vishoot<sir_funzone at yahoo.com> wrote: > > hello all, > > I have a setup that is raid 1 and put the mirrored drive back in and now it is still showing as degraded saying: raid1: raid set md6 active with 1 out of 2 mirrors with this message on all the raids.i know i am wrong by saying this but i thought putting in the driving and rebooting would start the re syncing itself. what do i have to do to add this back in, i am so confused with this process. > > centos 4.x > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > Well, just putting a new disk drive in the place of the bad one doesn't cut it. You have to recreate partition table and then add the partitions to the drive. e.g. sda = the old disk in the raid that has not failed sdb = the newly added disk dd if=/dev/sda of=/dev/sdb bs=512 count=1 That'll replicate the partition table and mbr to the new disk. Then starting addinf the new partitions to the linux raid: mdadm -a /dev/sdb1 /dev/md0 and so on, depending what your setup is. Do a: cat /proc/mdstat and see what partitions are added to which raid. Alternatively to a google search for howtos (e.g. http://www.gagme.com/greg/linux/raid-lvm.php ) and learn how to manage linux raid so you dont fsck up your system.