On Thursday February 21, jr-list-linuxraid@quo.to wrote: > I've got a problem. I created a RAID-1 array with only one drive by using: > > mdctl --create /dev/md0 --level=1 --raid-disks=1 /dev/hda2 > > Now, I've installed a second drive and want to add it to the array. So I > tried: > > mdctl -a /dev/md0 /dev/hdc2 > > But this does not work as expected. It adds /dev/hdc2 to the list of devices > in /proc/mdstat: > > md0 : active raid1 hdc2[1] hda2[0] > 6144768 blocks [1/1] [U] > > but it does not resync the array. I guess this has something to do with the > fact I originally specified --raid-disks=1. Can it be fixed without > rebuilding the array from scratch (i.e. without data loss)? Yes..... you said that you only ever wanted 1 disk in the raid-1 array. A pretty pointless configuration. What you should have done is mdctl --create /dev/md0 --level=1 --raid-disks=2 /dev/hda2 missing to say that you want 2 disks, but the second one is currently missing. You can fix this without loosing data. Just stop the array and re-create it with the correct information. The data on the drive will not be lost. So: make sure that /dev/md0 is not mounted and not in use. mdctl --stop /dev/md0 mdctl --create /dev/md0 --level=1 --raid-disks=2 /dev/hda2 missing mdctl --add /dev/md0 /dev/hdc2 and all should be fine. NeilBrown > > Thanks. > Jordan Russell > > - > 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
