On 21/05/20 12:24, David T-G wrote:

Sure enough, there it is.  Yay.

Now ...  What do I do with the last drive?  Can I put it back in and let
it catch up, or should it reinitialize and build from scratch?

Can't remember the syntax, but there's a re-add option. If it can find
and replay a log of failed updates, it will bring the drive straight
back in. Otherwise it will rebuild from scratch.

That's probably the safest way - let mdadm choose the best option.

Oh - and when you get your Ironwolves or whatever, read up on the
replace option. Much the safest option.

Cheers,
Wol