Hi, I had to do this a while ago, basically you have to mark the disk as failed (if not already) and than remove it from the array mark as failed > mdadm --fail /dev/md0 /dev/sdaX remove from array > madmad --remove /dev/md0 /dev/sdaX Partition your new disk to your needs and then add it to the array using mdadm again mdadm --add /dev/md0 /dev/sdbX to check the status of the array mdadm --detail /dev/md0 Hope this gives you a starting point. On Tue, Apr 1, 2014 at 10:21 AM, Roland RoLaNd <r_o_l_a_n_d at hotmail.com> wrote: > Dear all, > I'm not used to handling software raid. > I've inherited a server which has raid 10 set. > one of our disks failed, and it's to be replaced today. > My question is; any hint how to add this new disk to the existing raid array ? > first thought is :- Create identical partitions as other disks in the array i'd like to add it to.- add it to raid. > Though i'm extremely worried of messing things up and wiping all my data. > Any hint would be appreciated > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos