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I have a PCIe slot adapter for my U.2, with a fan blowing on it.

Firmware updates without useful change log are a pet peeve of mine.

Gaming - no. Workstation - depends on the work. I can imagine that compiles of large systems speed up by a couple of percent. Putting your Chrome profile on one could be beneficial. I have my gaming machine Windows boot on Optane but never measured whether it actually does anything faster.

mdadm is very good software but since it separates filesystem and raid it has the "raid hole". Not their fault but a disadvantage nontheless. Never ran btrfs and probably never will.

RAID6 is absolutely worth it over RAiD5. The problem is that after a drive failure you rsync a new drive. And the resync puts a lot of stress on the remaining old drives. At a time where one more drive failure takes your array offline. As for OS, I would use ZFS on FreeBSD, possibly inside Proxmox.

Related, makemkv now has a software solution when your drive lacks 4k firmware. Didn't try it yet.

It's actually pretty hard/annoying to track down any many-disks chassis lately. I'm still feeding off Cooler Master Stacker 810 cases that I bought ca. 2005.

You need a decent size catapult.

Increasing readahead on the server should help. (I do not know how to tell Windows to do that)

I would give it a shot without the crypt layer, just for testing.

I used to prefer heterogenous drive setups in RAID for exactly this reason. But the logistics got annoying and I stopped.

I think they just send you new cables after asking you whether you indeed got external ones. I didn't get mine yet. Check your ebay inbox.

They are sending messages to buyers to correct the cable situation.

Yes, I got this with mine. I am still confused about whether that is supposed to have battery backup.

How can I tell? I have a second (small) PCB floating next to the heatsink.

Also got the message about exchanging the external cables. 1A seller it seems.

My second drive is 37000 hours.

Dunno. I guess I'll know when I see it. In general I want reallocated sector count to be zero on refurb drives.

My first drive is 38880 hours. Extremely well packaged.

It's better to do a full read pass first so that the disk doesn't have a chance to reallocate sectors.