On 10:01, Lars Täuber wrote: > Here we have another problem with our RAID6 and 16 HDDs: > > monosan:~ # mdadm -V > mdadm - v2.6.2 - 21st May 2007 > monosan:~ # mdadm -C /dev/md4 -l6 -n 16 -x 0 /dev/dm-* > mdadm: /dev/dm-0 appears to be part of a raid array: Run mdadm --zero-superblock /dev/dm-0 before creating the array to get rid of these. > monosan:~ # mdadm --detail --scan| fgrep md4 >> /etc/mdadm.conf Please post your /etc/mdadm.conf > monosan:~ # mdadm -A /dev/md4 > mdadm: WARNING /dev/dm-9 and /dev/dm-8 appear to have very similar superblocks. > If they are really different, please --zero the superblock on one > If they are the same or overlap, please remove one from the > DEVICE list in mdadm.conf. Are you sure dm-8 and dm-9 are different devices? pvdisplay /dev/dm-9; pvdisplay /dev/dm-8 should tell you. > This happens _always_ when the arreay is reassembled. The actual > devices with the duplicated superblocks differ sometimes. If I read the code correctly it means that the two devices have identical superblocks, the same event count and the same minor number, so mdadm thinks dm-8 and dm-9 are overlapping partitions. > Are 16 drivesmda too much for RAID6? No, raid6 supports up to 254 devices (there are other reasons for not using too many devices for raid6 though). Andre -- The only person who always got his work done by Friday was Robinson Crusoe
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