I wanted to update two smaller drives with two larger. I started with the smallest drive (2TB) and replaced it with a (4TB) when it was safe to do so.
I let the Drobo 5D build (flashing green and yellow) for over 24 hours - until I checked on the unit and the power light was yellow (no other lights on). I allowed that to remain like that for a couple of hours before assuming the rebuild was done.
Powered the unit down, then back up, and everything was green.
At this point, I backed up some data to it from my Mac, all still green, Drobo Dashboard confirming good health and new space, and when done, powered down the unit in Drobo Dashboard.
This is when something changed…
I powered 5D back on (now not connected to Mac) so that I could replace the other smaller drive. But on startup, the unit began to rebuild (again yellow and green flashing lights)…HOWEVER…only 4 of the 5 bays were doing so. The newly replaced drive is not lit up.
Never had a chance to replace the second drive yet. The Drobo is still rebuilding.
Any help would be a great help!