Drobo

Upgrade from 4 to 5 drives and swap 2 out - how?

Hello, i currently have a Drobo S with 4 2TB Drives. Drives 1&2 are from manufacturer A and 3&4 are from B. I want to replace 3&4 with 3 new drives from A. How do i go about it? Do i first add the fifth drive and then swap out drive 3 and after Drobo S has returned to a save state then swap out 4 or do i first swap an then add the fifth drive? DualDisk Redundancy is enabled.

You can add drives at any time.
However, you can only remove drives when Drobo is ready - or you risk losing data.

It is important not to remove any drives while Drobo is blinking green-yellow/orange.

Since you have an empty bay, I would first add the new drive from A into the empty slot. This helps to avoid degrading from DDR to SDR during the next steps, unless your new drives are smaller than the ones you’re replacing.

Then
Replace drive 3 with new drive from A
Wait for relayout to complete
Replace drive 4 with new drive from A
Wait for relayout to complete (or at this point you can go about normal business, just remember that Drobo will be significantly slower until the relayout is completed).

Great, thanks. I added the fifth drive and an then swapped #3 for a new one. Dashboard says about 12h for relayout to complete.