I bought my Drobo over 6 months ago. To get me started, I just bought two 1TB drives. I churned happily along for a few weeks. Then when I was cleaning out some of my old computer equipment, I found a 100GB SATA drive I had long replaced in my PC with a 500GB. I figured, rather than let it collect dust in the closet, I’d pop it into my Drobo. I was happy to see I now have almost a full TB available with the two 1TBs and the 100GB minus overhead.
Just out of curiosity the other day, I went to use the Drobo calculator. I wanted to simulate a drive outage. The closest to my 100GB I could find on the app is an 80GB (close enough), so I simulated two 1TBs and one 80GB, for a total of 1003.8GB of usable data. I removed the 80GB, and as I expected, ended up with 930ish GB of usable space. But what shocked me is I reset it (two 1TBs, 1 80GB), and then simulated a failure of one of the TBs, and I end up with 72.8GB of usable space. However, if I simulate having only the two 1TBs, and I simulate the failure of one, I end up with 464GB of usable space.
So my question is, am I really just hurting myself by having the smaller drive in there? Should I just take it out and go with the two 1TBs for now? I know I should get more big drives in there but that will come eventually. But for now, should I just ditch the small one and use the two TBs? What if I keep all three – what happens if I have, say, 200GB worth of data, and I lose one of the TBs? If my “usable” space goes below the data I have on there now, what happens??
Thanks in advance! Sorry for making a short story long…