I understand that chaining many Drobos will cause instability, connection, and speed problems. I don’t use Firewire a lot, so I’m curious whether or not this is a per-port problem or if it’s per bus? That is, would there be any difference between four Drobos chained together versus two Drobos chained and connected to one port and the other two Drobos chained and connected to a second port, but both of those ports using the same hub? (I ask, because I believe the Mac Pro 3.1 only uses one Firewire800 bus).
Additionally, what are the performance hits or improvements one might expect with two Drobos chained together versus two Drobos plugged directly into the computer via Firewire800?
I would surmise that copying between two chained Drobos would be much faster and copying to the Drobos from the computer or the other way around would be the same and that performing activities from the computer to both Drobos simultaneously would be poor (I/O contention).
Using two ports on the same Firewire bus, would the Drobo<–>Drobo or Drobo<–>Computer performance be any different in any circumstance?
I’ve only been able to do limited testing as I’m stuck in the middle of a significant data transfer that is going to take some time. I’ve researched what I could on this subject, with no conclusive answers so far.
Any insight is surely appreciated.