I just wanted to alert everyone to the fact that KB4467697 (November OS quality rollup; now superseded by KB4471320) caused huge I/O issues for our platform. After investigating for two weeks why our I/O and FillDB were through the roof, we realised that it had started shortly after this update was applied. We rolled the update back and rebooted the server on Wednesday morning of this week, and the issues all but disappeared.
I contacted IBM to let them know, and they saw one other customer had an issue with different symptoms, but caused by the same patch:
Just a head’s up, in case anyone else is struggling with similar symptoms. We have a large environment (125k endpoints), so may be affected more than most… But @jgstew encouraged me to share the info, so here we are