First options mincache=direct, convosync=direct requires OnlineJFS product.
This is additional $$ product.
Now if you look at man page of vxfs_mount, it says that datainlog and nodatainlog apply to synchrous writes. nodatainlog requires OnlineJFS.
Check following thread and my response in that. It has great document that talks about it in depth.
There is not much of performance improvement with nodatainlog.
Also nodatainlog means samll writes(less than 8kb) are not logged immediatley, but little later. So, there is a element of data intrgrety involved. I always choose datainlog.
About, mincache and convosync, in case of oracle you can do that. It makes sense to avoid double caching-at oracle level and fs level. But studies have shown that it does do great improvement to performance. But still ok to do that to get that very little performance improvement.
There is no substitute to HARDWORK
