Hi, This is the second version of the raid5/6 caching layer patches. The patches add a caching layer for raid5/6. The caching layer uses a SSD as a cache for a raid 5/6. It works like the similar way of a hardware raid controller. The purpose is to improve raid performance (reduce read-modify-write) and fix write hole issue. The main patch is patch 3 and the description has all details about the implementation. Main changes of V2 are to improve performance. Meta data write doesn't use FUA any more. Discard request is only dispatched when discard range is big enough. Also have some bug fixing and code cleanup. Please review! Thanks, Shaohua Shaohua Li (5): raid5: directly use mddev->queue raid5: A caching layer for RAID5/6 raid5: add some sysfs entries md: don't allow resize/reshape with cache support raid5: skip resync if caching is enabled Song Liu (1): MD: add a new disk role to present cache device drivers/md/Makefile | 2 +- drivers/md/md.c | 14 +- drivers/md/md.h | 4 + drivers/md/raid5-cache.c | 3519 ++++++++++++++++++++++++++++++++++++++++ drivers/md/raid5.c | 97 +- drivers/md/raid5.h | 16 +- include/uapi/linux/raid/md_p.h | 73 + 7 files changed, 3705 insertions(+), 20 deletions(-) create mode 100644 drivers/md/raid5-cache.c -- 1.8.1 -- 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
