Recently our our 7 piece Syzygy tablebase server was struggling to complete its periodic RAID integrity check while being hammered with tablebase requests. We decided to try a new approach, using dm-integrity on LVM. Now, instead of periodically checking every data block, we passively check blocks whenever they are read. 17 TiB of tablebases are unwieldy, so to do this migration without hours of downtime, we set up a second server with the new approach. This also allowed us to run controlled ben...