On 20 May 2021, Leslie Rhorer outgrape: > On 5/19/2021 3:01 PM, antlists wrote: >> Yes you can explicitly specify everything, and get mdadm to recover the array if the superblocks have been lost, but it's nowhere >> as simple as "there are only three possible combinations". > > The number of permutations of the order of three drives is precisely six. The permutations are: > > 1, 2, 3 > > 1, 3, 2 > > 2, 1, 3 > > 2, 3, 1 > > 3, 1, 2 > > 3, 2, 1 > > The Examine stated it was 2, 3, 1, but the device order is not > at all unlikely to have changed. Once again, I was very explicit in > saying the simple create may not work and if not he is facing some > much more serious issues. That was and is in no way incorrect. The > odds one of them will work are not terrible, and if so, he is in good > shape. Are you seriously implying there is no way any of them could > possibly work? Of course not, but it's *likely* none will work. mdadm's default chunk size has probably changed since the array was created if it's more than a few years old, for starters.
