My 8x10TB drives from the other seller arrived. 7 drives have close to 27k hours, one has 19k. Gigabytes written and read varies wildly, one of them (not the low hours one) has only 8.5TB written and 1.5TB read. The one with the most usage has 475TB written and 35TB read. Most were manufactured in mid-2016 except one that was in w2 2017. Only one reads as having a valid serial on the HGST warranty checker, but it says to contact the JBOD manufacturer. The rest come up as an invalid serial number. I knew that going in though, and the seller (kl0 on ebay) offers their own warranty.
There was initially some screwiness but it turned out the SGI enclosure was only linking up at 3Gbps. Some power cycling and cable unplugging/replugging cleared that up; I'm not sure what was going on. Once they've had a few badblocks passes and I have data moved onto them I'll swap them into a Supermicro chassis where I expect cooling to be much less of an issue. They do in fact run hot, all 50-60C under load. There's not much airflow over them in that enclosure though as none of the other drive slots were populated and it's one I swapped low-noise (read: low-airflow) fans into; I've put some dummy drives in the other slots to try and force some air to actually move over the drives. As I type the comment out I see the ones that were at 60C have dropped to 56C. Not exactly cold but it's better than it was. I can't tell if they're loud or not over the other equipment in the rack. They sure do take their sweet time to spin up, 30 seconds after power-on to present a block device.
Edit: Now that it's been a few hours, the spread is 47-52C. Still not as cool as I'd like but it goes to show what a big difference a tiny amount of airflow makes.
