http://3cbzkrvakrpetjjppdwzbzqrlkmzatjs7jbyazap5gwutj32gcltjpqd.onion
Therefore, it may be that even though I have reduced the total I/O needed, the impact is unsubstantial because the real bottleneck is the “seeks” across the disk. Still, I gain the better backup support and silent data corruption prevention, so I kept btrfs.