When I request to replace sda with sdj (RAID6 in my case), does it create sdj from the other members (NOT using sda) or does it make a copy of (by reading) sda? I hope it is the former, assuming sda is having issues and the action is precautionary. I see on stackexchange is mentioned that it actually does the latter: http://unix.stackexchange.com/questions/74924/how-to-safely-replace-a-not-yet-failed-disk-in-a-linux-raid5-array And while I am here, can I replace two members at the same time? This should save time as it takes about 10 hours to reconstruct a 4TB member. TIA -- Eyal Lebedinsky (eyal@xxxxxxxxxxxxxx) -- 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