Dell SAS 5/ir - secondary disk update "data will be lost!" - will all data, or just secondary disk?

Solution 1:

Having come across the same issue on an identical platform again, with no valuable data, I decided to see what would happen and just pressed "Commit Changes" after being given that warning.

It turned out that this does did not lose the array, and added the new disk to the existing raid 1 array, as expected.

As I suspected, the error message was just too vague: it should have stated that "You will lose data on the new member disk that you are about to add to the existing array, the existing drive will not be touched'.

Potentially they made the error message intentionally vague so they could re-use it.