I wasn’t building RAID arrays when this paper was written, but I have always heard RAID6 is to be avoided and to just use RAID10 (or RAID5 if you don’t have enough disks). Lately I’ve heard (and agree) the conventional wisdom is to avoid hardware RAID altogether in favor of redundancy solutions at the OS level such as MDADM on Linux or Storage Spaces on Windows (macOS supports software RAID as well, created for their now-dead Fusion Drive system).<p>I feel like the need for a triple-redundancy option in RAID is superseded by more “advanced” software “RAID” at the file system level such as ZFS or ButterFS (to an extent). Further, the increased availability and affordability of ECC RAM in non-enterprise hardware makes the call for additional redundancy even less-urgent.<p>There is a nicety to having that backup battery on a RAID card for write-through operations to finish in the event of a power outage, however this is easily-solved by a UPS. In the event of a power outage, not losing any data I <i>might</i> have been transferring to the array is nice, but I’m still losing my OS state and any unsaved things I may have been working on.