I had all green and 1 yellow light on my drobo S. I went ahead and replaced the 2TB drive with a 4TB drive and then all my lights went red with one flashing (3TB drive) and said I had removed too many drives and to put them back. I replaced the drive I took out with the original one and they stayed all red and one blinking. I then rebooted my drobo and they were all green and the one I tried replacing went red and continued to tell me to replace the drive. After a few minutes all the lights began blinking green/yellow in data protection mode. I believe it is rebuilding now using the old drive 2TB drive. I am waiting till it is out of data protection mode to try replacing again.
How do I replace the new 4TB drive successfully this next go around without getting the all red lights and too many drives removed issue?
Current Drive Sizes: (1) 4TB, (2) 3TB & (2) 2TB