Adding new disks advice

I’ve currently got 3 x WD GP 750Gb drives in my (V1) drobo. I’m looking to add 2 x 1Tb WD Green drives thereby filling the remaining slot and replacing one of the drives.

Is there any particular order that I should add / remove drives to achieve this upgrade?



I would only replace one at a time, then wait for the re-layout to finish before replacing the 2nd drive. It shouldn’t matter which one you do first.

I would add one 1TB drive to the fourth slot, let it finish its relayout, then replace the drive in slot 1 with another 1TB drive.