I was also running storage with default settings for years without any problem but I had one storage performance issue which actually had nothing to do with VMware at all and EMC came in for fixing the actual issue and gave some additional recommandations, IOPS setting change is one of them. As per them they have done hundreds of tests and changing IOPS gave them good results which I don't see documented anywhere. Now I have implement it but I wanted to check if it can also do some
harm to my environment or not.