# \[PATCH\] raid5: allow arbitrary max\_hw\_sectors

- From: Shaohua Li \<hidden\>
- Date: 2016-09-08 17:49:06 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2016/09/6632792
- Thread: https://ratatoskr.run/linux-raid/2016/09/6632792/t.md

```text
raid5 will split bio to proper size internally, there is no point to use
underlayer disk's max_hw_sectors. In my qemu system, without the change,
the raid5 only receives 128k size bio, which reduces the chance of bio
merge sending to underlayer disks.

Signed-off-by: Shaohua Li <redacted>
---
 drivers/md/raid5.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b95c54c..fc0b600 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7066,6 +7066,8 @@ static int raid5_run(struct mddev *mddev)
 		else
 			queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD,
 						mddev->queue);
+
+		blk_queue_max_hw_sectors(mddev->queue, UINT_MAX);
 	}
 
 	if (journal_dev) {
-- 
2.8.0.rc2

```