I’ve got a brand-new Drobo Gen 3 4-bay (the one that just started shipping a few weeks ago), and I’ve got four 1.5TB Seagate Barracuda drives installed in it. I bought it to use with a Linux machine, so I formatted it as one big 16TB Ext3 partition, starting on block 2048, using gdisk (gptfdisk). I mounted it on one of my computers and copied over just over 3 TB of data (via USB 2; took over a day), so it’s at 79% full.
Then I moved it to the machine it will be working with, an Intel NUC (Haswell i5 chipset) running a 3.12 Linux kernel. All the USB ports are 3.0. It mounts just fine, and from the computer’s point of view it’s just fine.
But it runs the hard drives. All the time. Constant drive head seek chatter. After several hours, the drives are quite hot. (the Drobo’s fan seems to be fine, if at low speed.) Even though nothing was accessing it, it won’t go into spin-down mode (dim LEDs). Which is odd because it did go into spin-down mode after it finished that initial 3+ TB copy.
Anyway, not being interested in losing the drives early due to wear, I shut it down cleanly. I’ve tried various tests with it; the most telling is that it sat there and ran the drives for over two days straight, never spinning down the drives, without its volume being mounted at all. (Unplugging the USB cable results in the Drobo going into standby mode, no LEDs on, within a couple of seconds.)
I’ve moved it to another machine (AMD chipset) and it seems to behave the same whether on a USB3 or USB2 port. Chatter starts within a few minutes, drives are hot within ten minutes.
Drobo Dashboard (when I have it plugged into a Mac) is convinced everything is A-OK.
So I’m wondering if anyone has any ideas of things I can try next. Thanks for your time.