Has this been discussed here? Has anything changed since it was written? Parity-based redundancy (RAID5/6/triple parity and beyond) on BTRFS and MDADM (Dec 2014) – Ronny Egners Blog http://blog.ronnyegner-consulting.de/2014/12/10/parity-based-redundancy-raid56triple-parity-and-beyond-on-btrfs-and-mdadm-dec-2014/comment-page-1/
TL;DR: There are patches to extend the linux kernel to support up to 6 parity disks but BTRFS does not want them because it does not fit their “business case” and MDADM would want them but somebody needs to develop patches for the MDADM component. The kernel raid implementation is ready and usable. If someone volunteers to do this kind of work I would support with equipment and myself as a test resource. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
