Nifty! If I do this with 2 drives and want to install a 3rd drive later on is there an losless upgrade path to RAID-5? I know that raidreconf can do some cool things these days..is this by chance one of them? Chris Neil Brown wrote: >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 > -- Real Men Don't Waste Their Hormones Growing Hair. -- Real Men Don't Waste Their Hormones Growing Hair. - 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
