For some time I got information on SmartOS box that Fault Management is sending mails to root that some PCI-E device had some problem. Even I weren't smart enought to debug it, I changed added PCi-E network card and.. 2 days no fma errors. (Intel i5-7500 box) So I guess Fault Management saved some future day :P

That machine was always funny for some slowness waiting any commend from global zone to start, to small hints are also important :P