On 08/01/17 04:13, Stan Hoeppner wrote: >>> >>> This sounds like one of the few use cases where they might be a good >>> idea. Worth considering, at least. Might even work well in your planned >>> raid-6 config. >>> >> Yea, I thought about that too. So you're suggesting a RAID1 consisting >> of (2) RAID6 arrays. > That's not sane. RAID 10, or more precisely, RAID 0 over many RAID 1 > pairs, will yield more usable capacity and without the parity penalty or > RMW cycles. I was actually thinking pure raid-6. Which was Benjammin's original idea. The thing to bear in mind is that for these drives, rewrite performance is going to be abysmal, but in this particular scenario rewriting is going to be unusual, anyway. What we *don't* want with these drives is RMW. It's just struck me, this might be where it's worth sticking a small SSD in front of the array as a journal, and flagging these drives as "write mostly". But I'm not sure whether this functionality is yet standard or are the devs still working on it? Cheers, Wol -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
