Thanks to swedenlike on irc linux-raid , I did force -assemble sd[abefg] then add sdc Resynching now root@Zetta:~# mdadm --add /dev/md0 /dev/sdc mdadm: added /dev/sdc root@Zetta:~# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid6 sdc[7] sdf[0] sdg[6] sdb[4] sde[3] sda[2] 5860548608 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/5] [U_UUUU] [>....................] recovery = 0.0% (582896/1465137152) finish=209.3min speed=116579K/sec unused devices: <none> I will have to get some help to fine tune my mdadm , since it appears my sdg has a wrong offset (and myabe my sdc will) Thanks -- 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