I have a drobopro - Its currently setup with 3x1.5TB drives plus 3x1TB drives, dual redundant - which is 7TB total capacity, 4TB available. I have 2.3TB of this space
While I was setting the system up, I was replacing a 500GB drive with a 1TB drive - I accidently knocked out one of the 1.5 drives. The drobo and data survived of course (it took about 15 hours to recover, after replacing the drives) - but i noticed when i knocked out the 2nd drive, the blue lights went up from about 60% usage to about 80%. Then down again when the drives were inserted.
This got me thinking - if the drobo is “data aware”, and moves data around as required for raid redundancy - surely then its possible for the drobo to survive multiple drive failures beyond the 2 failures already allowed for in “Beyond Raid”.
For example - say I upgraded my drobo to 3x1.5TB+5x1TB drives by slotting in an extra 2 1TB drives in the spare bays, but retained the same current data usage (2.3TB)
Just say all 5 1TB drives - and even one of the 1.5TB drives as well - failed over the course of (say) a week. Would the drobo and data survive?
I think - given enough recovery time after each failure - it would! If so, it indicates that if you have a drobopro - it makes sense to fill it to capacity (ie, use all 8 bays if possible), even if you use much less space than that is available.
Any thoughts? .