Hi, These are the patches to add a caching layer for raid5/6. It 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. This also requires mdadm utility changes, which Song will send out later. Comments and suggestions are welcome! Thanks, Shaohua Shaohua Li (4): raid5: directly use mddev->queue A caching layer for RAID5/6 raid5-cache: add some sysfs entries md: don't allow resize/reshape with cache support 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 | 3252 ++++++++++++++++++++++++++++++++++++++++ drivers/md/raid5.c | 90 +- drivers/md/raid5.h | 16 +- include/uapi/linux/raid/md_p.h | 73 + 7 files changed, 3431 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
