On Mon, Jun 21, 2021 at 8:13 PM opengers <zijian1012@gmail.com> wrote:

Thanks for the answer, I still have some confusion when I see the explanation of "MDS_SLOW_REQUEST" from the document , as follows ------ MDS_SLOW_REQUEST

Message “N slow requests are blocked”

Description One or more client requests have not been completed promptly, indicating that the MDS is either running very slowly, or that the RADOS cluster is not acknowledging journal writes promptly, or that there is a bug. Use the ops admin socket command to list outstanding metadata operations. This message appears if any client requests have taken longer than mds_op_complaint_time (default 30s).

FROM: https://docs.ceph.com/en/latest/cephfs/health-messages/ ------

"or that the RADOS cluster is not acknowledging journal writes promptly", from this sentence, it seems that "MDS_SLOW_REQUEST" also contains OSD operations by the MDS?

Yes. If you have slow metadata IO warnings you will likely also have slow request warnings. -- Patrick Donnelly, Ph.D. He / Him / His Principal Software Engineer Red Hat Sunnyvale, CA GPG: 19F28A586F808C2402351B93C3301A3E258DD79D