Sorry for intruding on the patch reviewing process and for the novice
question.
Is this caching layer also suitable for a smaller system with only one
raid5 where /boot and / resides? Or is it meant for dedicated data
storage(s) only?
Regards
Davor Vusir
-------- Vidarebefordrat meddelande --------
Ämne: [PATCH v3 0/8] MD: a caching layer for raid5/6
Datum: Wed, 3 Jun 2015 15:48:35 -0700
Från: Shaohua Li <shli@xxxxxx>
Till: linux-raid@xxxxxxxxxxxxxxx
Kopia: Kernel-team@xxxxxx, songliubraving@xxxxxx, hch@xxxxxxxxxxxxx,
dan.j.williams@xxxxxxxxx, neilb@xxxxxxx
Hi,
This is the third 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. Please review!
Thanks,
Shaohua
V3:
-make reclaim multi-thread
-add statistics in sysfs
-bug fixes
V2:
-metadata write doesn't use FUA
-discard request is only issued when necessary
-bug fixes and cleanup
Shaohua Li (7):
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
raid5: guarantee cache release stripes in correct way
raid5: multi-thread support for raid5 caching reclaim
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 | 3775
++++++++++++++++++++++++++++++++++++++++
drivers/md/raid5.c | 177 +-
drivers/md/raid5.h | 25 +-
include/uapi/linux/raid/md_p.h | 73 +
7 files changed, 4022 insertions(+), 48 deletions(-)
create mode 100644 drivers/md/raid5-cache.c
--
1.8.1
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