>In general, I get the feeling that these SMB2+ cache parameters are for situations where files are infrequently or rarely shared via SMB on a network. To be fair, how often are files shared other than flat-file/ISAM databases? Multiple people can open the same Office document but the 2nd and later users get it read-only, as sharing goes it's not sophisticated. In that scenario the default cache settings can reduce network traffic and load on the server.

And that seems to be the only scenario they teach at M$ courses. As early as 1998. I had some networking issues (files closed at random) and the customer had a network guy come to check. He just opened a word document across the network, saved it and said everything was fine, it must be our app.

Later it got worse.