Thanks Stefan,

i played with bluefs_buffered_io but i think the impact is not great since the 
nvmes are so fast.
I think buffered IO on increased cpu load while buffered io off increase nvme 
load. Problem was with both settings.

I am not sure if require-osd-release was run. What do you think ceph osd 
require-osd-release pacific will do and is there a risk when running the 
command that the cluster might become unavailable ?

I think all osds are running 16.2.6 anyway and so it would not change anything 
if i set the force to run  Pacific ?


On Wed, Nov 10, 2021 at 04:22:14PM +0100, Stefan Kooman wrote:
> On 11/10/21 16:14, Christoph Adomeit wrote:
> > I have upgraded my ceph cluster to pacific in August and updated to pacific 
> > 16.2.6 in September without problems.
> 
> Have you set "ceph osd require-osd-release pacific" when you finished
> upgrading (this sometimes gets forgotten)?
> 
> Is "bluefs_buffered_io" set to true on the OSDs?
> 
> Gr. Stefan
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