On Sat, February 7, 2009 8:47 am, Thomas J. Baker wrote: > On Sat, 2009-02-07 at 08:01 +1100, NeilBrown wrote: >> On Sat, February 7, 2009 7:32 am, Thomas J. Baker wrote: >> >> > Thanks for the info. I think I follow everything. One last question >> > before really trying it - is this what is expected when I actually run >> > the command - the warnings about previous array, etc? >> >> Yes, you would expect exactly those messages. >> >> NeilBrown >> > > OK, first I put the drives back to their original configuration (I had > swapped two banks to make them appear physically as the kernel sees them > logically to make it easier to track down the possibly faulty disks.) > For clarity, I put them back to the original configuration before trying > anything. > > Next I ran > > mdadm --create /dev/md0 --verbose --level=6 --raid-devices=26 \ > /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 missing \ > /dev/sdi1 missing /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 \ > /dev/sdp1 /dev/sdq1 /dev/sdr1 /dev/sdt1 /dev/sdu1 /dev/sdv1 \ > /dev/sdw1 /dev/sdx1 /dev/sdy1 /dev/sdz1 /dev/sdaa1 /dev/sdab1 You said "--raid-devices=26". Why did you do that? It should be '27'. You need to have 25 real devices and 2 'missing' devices. 24 of those real devices you can identify the correct position for by looking at the --examine information from before you tried to recreate the array. The 25th real device you have to guess which is likely to be the right one. > > which completed but when I fsck'd the disk, it wasn't happy, complaining > about a missing superblock on /dev/md0. I then stopped the array. I'm > not sure what to do next. It seems like the examine information of all > the disks has been updated by the last create. I guess I should only go > by the previous examine? As for the missing statement, should that only > relate to drives with no md superblock? Yes, go by the previous examine information. The 'missing' can be any two devices. The important thing is the devices that aren't 'missing'. They need to be devices that you have reason to believe belong to that slot in the array. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
