On Wednesday May 7, afu@fugmann.dhs.org wrote: > Hi, > > Sorry if this is the wrong list to post this on. > > I have made an error when creating a new raid1 array as I specified that > the raid should consist of only one disk. Now, I would like to add > another disk, but mdadm insists on adding it as a spare disk, offering > no data redundancy. > > Before: > md0 : active raid1 ide/host0/bus0/target0/lun0/part1[0] > 1048704 blocks [1/1] [U] > > After running > # mdadm -add /dev/md/0 > /dev/ide/host0/bus0/target0/lun0/part1[0] > > md0 : active raid1 ide/host0/bus1/target0/lun0/part1[1] > ide/host0/bus0/target0/lun0/part1[0] > 1048704 blocks [1/1] [U] > > > I have read the manpages, and tried googling without success. > I do not wish to destroy the data on the discs, and recreate the array > but It might be a last resort. Can anyone help me convince mdadm to add > the 2. partition as an active disk. You cannot add a new data drive to a raid1 array. If you shut down the array and re-create it you should not loose data. The correct command to use would be something like: mdadm --create /dev/md0 --level=1 -n 2 /dev/ide/host0/bus0/target0/lun0/part1 missing Note the word "missing" at the end. This tells mdadm to create a 2-drive array with one missing drive (and so only one active drive). This will have the same data as the old md0. Now "mdadm --add" should do what you want. NeilBrown > > Regards > Anders Fugmann > > P.s. > Please CC me, as I'm not subscribed to the list. > > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
