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 [off-list ref]
Till: linux-raid@vger.kernel.org
Kopia: Kernel-team@fb.com, songliubraving@fb.com, hch@infradead.org, 
dan.j.williams@intel.com, neilb@suse.de

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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