On 3/26/2014 3:00 PM, Tide wrote: ... > ================= > Array 2 (RAID 6): > ================= > # mdadm --examine /dev/sdb1 ... > Raid Level : raid6 > Raid Devices : 5 ... > Bad Block Log : 512 entries available at offset 72 sectors The RAID6 array has sectors on each drive reserved for bad block reassignment. The RAID5 array does not. This is the answer to your mystery. Cheers, Stan -- 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