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| author | Mariusz Dabrowski <mariusz.dabrowski@intel.com> | 2019-02-18 15:04:09 +0100 |
|---|---|---|
| committer | Song Liu <songliubraving@fb.com> | 2019-03-12 10:15:18 -0700 |
| commit | a596d08677320925b69e70c0fdc4c0f59384a65e (patch) | |
| tree | 7ba718e75decf5f3c210a30386229a410c7b1829 /Documentation/admin-guide/md.rst | |
| parent | 9205e44916b2ca2e959be4210133292a19e79b0d (diff) | |
| download | lwn-a596d08677320925b69e70c0fdc4c0f59384a65e.tar.gz lwn-a596d08677320925b69e70c0fdc4c0f59384a65e.zip | |
raid5: set write hint for PPL
When the Partial Parity Log is enabled, circular buffer is used to store
PPL data. Each write to RAID device causes overwrite of data in this buffer
so some write_hint can be set to those request to help drives handle
garbage collection. This patch adds new sysfs attribute which can be used
to specify which write_hint should be assigned to PPL.
Acked-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Diffstat (limited to 'Documentation/admin-guide/md.rst')
| -rw-r--r-- | Documentation/admin-guide/md.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/admin-guide/md.rst b/Documentation/admin-guide/md.rst index 84de718f24a4..3c51084ffd37 100644 --- a/Documentation/admin-guide/md.rst +++ b/Documentation/admin-guide/md.rst @@ -756,3 +756,6 @@ These currently include: The cache mode for raid5. raid5 could include an extra disk for caching. The mode can be "write-throuth" and "write-back". The default is "write-through". + + ppl_write_hint + NVMe stream ID to be set for each PPL write request. |