Details
-
Improvement
-
Resolution: Fixed
-
Major
-
Lustre 2.15.0
-
9223372036854775807
Description
When LSOM is not used at cluster it is better to disable it, I don't see such option for now.
During analyze of MDS vmocre with high load avarage, we have found LSOM feature add big impact to it.
205 threads were blocked with mdt_lsom_update(). A few threads got further and were waiting for the osd lock for read. It seems that mdt_lsom_update() has a serious issue with a single shared file because of its mdt-level mutex for every close request.