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
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
On 01/04/14 19:21, Roland RoLaNd 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 >Remember to set the "Linux raid autodetect" flag (fd) on the partition. take a look into /proc/mdstat # cat /proc/mdstat To adjust the speed of rebuild look here: /proc/sys/dev/raid/speed_limit_max /proc/sys/dev/raid/speed_limit_min You can adjust them by echo-ing a new value directly into them: # echo 1000000 > /proc/sys/dev/raid/speed_limit_max and make that permanent by setting it in /etc/sysctl.conf dev.raid.speed_limit_max = 1000000 when you do finally get to rebuilding the array, use 'watch' to monitor the rebuild. # watch 'cat /proc/mdstat' Then follow JC's exampled and you should be right. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 263 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20140402/57bfb307/attachment-0002.sig>