5 Feb
2020
5 Feb
'20
12:44 p.m.
Hi, This helped to disable deferred writes in my case: bluestore_min_alloc_size=4096 bluestore_prefer_deferred_size=0 bluestore_prefer_deferred_size_ssd=0 If you already deployed your OSDs with min_alloc_size=4K then you don't need to redeploy them again.
Hi Vitality,
I completely destroyed the test cluster and re-deployed it after changing these settings but it did not make a difference - there are still a high number of deferred writes.
Regards -- Brad.
On Wed, 5 Feb 2020 at 10:55, <vitalif@yourcmc.ru> wrote:
min_alloc_size can't be changed after formatting an OSD, and yes, bluestore defers all writes that are < min_alloc_size. And default min_alloc_size_ssd is 16KB.