On Sun, Apr 08, 2012 at 05:07:28PM -0300, Salatiel Filho wrote: > On Sun, Apr 8, 2012 at 14:09, Heinz Diehl <htd@xxxxxxxxxxxxxxxxx> wrote: > > On 08.04.2012, artificial11000 wrote: > > > >> ?mdadm --create --level=5 -n 3 /dev/md127 /dev/sdb /dev/sdc /dev/sdd > > ? ? ? ? --------- > > > > Seems your data is gone, forever. You created a new raid manually, > > which means that you deleted all your previous data. > > > > You have a backup, do you? > > > > _______________________________________________ > > dm-crypt mailing list > > dm-crypt@xxxxxxxx > > http://www.saout.de/mailman/listinfo/dm-crypt > > I disagree. I got some missing superblock sometime in the past while > assembling the array. Recreated it using mdadm -C with the same > parameters for the raid-level and raid-devices and it did not touch my > encrypted data. I was able to mount just fine after that. I always > thought that mdadm would touch only their own superblock when > creating. No, it recreates the parity stripes. It has to, otherwise RAID consistency checks would fail. If, for any reason, drive/device order or stripe size is diferent, this will scramble your data. The data is still there unless you write to the array, see my other answer. It also overwrites the RAID superblocks. If everything is the same, the original data will be there though, because the new parity stripes are exactly at the same positions on the same disks as the old ones and created from the same non-parity stripes. > Though at that time i had a degraded array and my array is > built on partitions , not the whole disk. On a degraded array, you should always only (re-)add the missing device or a replacement. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision. -- Bertrand Russell _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
