>>>>> "Dan" == Dan Williams <dan.j.williams@xxxxxxxxx> writes: >> + /* Data integrity passthrough not supported on RAID 4, 5 and 6 */ >> + if (pers->level >= 4 && pers->level <= 6) + return 0; Dan> Do you have a reference to the issues in supporting this? Not really. The protection information is an extra 8-bytes of stuff per sector. But it comes down in a different buffer. To do R-M-W effectively we'll have to maintain a separate protection information stripe cache. And we'll have to generate DIF checksums and reference tags for the parity sectors going out. Quite frankly it's a lot of ick and I haven't completely wrapped my head around it yet. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
