Glycerine
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Glycerine's post in Slow Parity check/rebuild. What affects it? was marked as the answerMoved the card over a slot and got 8x in BIOS, but speeds were still wonky. Placed new HBA card into that same slot, still at 8x, and getting a solid 150MB/s on parity with a total of 2.7GB/s r/w. I would think this means it's running at 4x since 8x ought to be around 4.5GB/s total unless UNRAID itself is slowing down the reads? Maybe because two parity? 150MB/s seems to be the mark on a majority of parity speeds i've seen here so I'm assuming it's running full speed. Just over a day estimated to do 16TB dual parity check
In either case, i'm chunking this up to HBA HW failure and marking as resolved.