I Feel the Need
MacWorld connected and daisy chained 36 external hard drives to a new Mac Pro. Why? Because they had 36 external hard drives and a Mac Pro -- I know I'd do it if I could. More:
While a dozen or so of these drives were bus-powered, most required external power. We plugged 24 power cords into three power strips and plugged each of those strips into a Watts Up power meter. When running a script that copied data from the Mac Pro’s internal PCIe connected flash storage to each of the drives, the combine power draw peaked at a whopping 865 Watts.
The script also tracked the amount of time it took each drive to write 6GB of data. The fastest was OWC’s Mercury Helios, which was able to write at an average of 271 MBps with all other drives running.
That's an impressive write speed even without competing for CPU time with 35 other drives. 36 others if you count the boot SSD inside the Mac.
My needs are slightly more modest. I picked up a stock six-core Pro a couple weeks ago, with two external drives. The first is a 4TB LaCie d2 Thunderbolt drive for my Time Machine backup. Its only job is to stay out of my way until I mess something up. Or until we get an evacuation order some summer due to wildfires -- it's nice to be able to grab just one drive and then scoot. The second is a 4TB LaCie 2big, also Thunderbolt, in a striped 2TB RAID 0 config.
I dunno how fast that thing is, but I honestly can't tell a difference between the LaCie RAID and the PCIe SSD boot drive. The new setup is so fast that I'm considering merging my year-by-year Aperture photo libraries into one big-ass 250GB library.
Because like the MacWorld guys -- why not?