On Mon, Jun 21, 2021 at 8:13 PM opengers <zijian1012(a)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