Hi, I found the reasen of this behavior change. With 14.2.10 the default value of "bluefs_buffered_io" was changed from true to false. https://tracker.ceph.com/issues/44818 configureing this to true my problems seems to be solved. Regards Manuel On Wed, 5 Aug 2020 13:30:45 +0200 Manuel Lausch <manuel.lausch@1und1.de> wrote:
Hello Vladimir,
I just tested this with a single node testcluster with 60 HDDs (3 of them with bluestore without separate wal and db).
With the 14.2.10, I see on the bluestore OSDs a lot of read IOPs while snaptrimming. With 14.2.9 this was not an issue.
I wonder if this would explain the huge amount of slowops on my big testcluster (44 Nodes 1056 OSDs) while snaptrimming. I cannot test a downgrade there, because there are no packages of older releases for CentOS 8 available.
Regards Manuel