----- Original Message ---- > From: "Lucian at lastdot.org" <lucian at lastdot.org> > To: CentOS mailing list <centos at centos.org> > Sent: Friday, July 3, 2009 3:45:44 PM > Subject: Re: [CentOS] software raid1 syncing > > On Fri, Jul 3, 2009 at 9:15 PM, Steven Vishootwrote: > > > > 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. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos Thank you Les & Lucian, I was able to fix the problem with your help, the first problem was an error between the chair and keyboard. I had forgot to turn the hard drive back on in the bios when i was trying to do some other stuff a while ago, so that caused me some grief and soon as i turned that on i was able to see the drive without having to do the "dd" command. ( i was trying to replace the mirrored drives and knock out the raid but i was not able to get the other drive up and running because i was having so much trouble with samba not working correctly). The second did help me and i was able to sync it up with no problems. again thanks steven