On 10/10/2013 12:54 PM, Digimer wrote:

quoted

Phil

What if I don't have rock-solid knowledge? Is there a way to connect the
four drives and query them to determine which is which? I was using the
new system (minus the new drives) plus a spare new 500GB drive with the
fresh centos install to do the testing yesterday. I am pretty sure I can
redo the cabling to match, but I always prefer safe over sorry. :)

Your mdadm -E reports clearly identified the order for the device names
at that moment.  You can replug drives and query them again if you like.
 Look for "Device Role :" in the output of "mdadm -E".  The numbering
starts with zero.

Thanks very much for your help so far!

You are welcome.

Phil