> Does anyone suspect a kernel regression here? I wonder if its worth it > to suggest testing the current version of all fairly recent kernels: > 4.5.rc1, 4.4, 4.3.4, 4.2.8, 4.1.16? I don't have any useful information about parity RAID modes or large arrays, so this might be totally useless. Nonetheless, just last week I added a 2TB drive to an existing Btrfs raid10 array (5x 2TB before addition) and did a balance afterwards. I don't take any numbers, but I was frequently looking at htop and iotop. I thought the numbers were extremely good: 100-120MB/s sustained for each drive with the "total" reported by iotop exceeding 600MB/s. That's with integrated sata controller on an Intel Z97 mini-ITX motherboard (cpu i4770). Significantly faster than anticipated. I started it one evening, and it was finished when I awoke the next morning. That was on 4.2.8-300.fc23.x86_64 with btrfs-progs 4.3.1. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
