JFS Mount option question

[Medavie]

Recently I have been told that putting a mount option of mincache=direct on a database file system for Oracle, I will get better response due to the fact that it acts more like raw disk and will bypass the buffer cache. This I will take as correct, but I also read in a document that specifically asked about the speed of mincache=direct which stated it did not matter which way the file system was mounted as anything >16k going to the file system would act in the same manner as mincache=direct without actually mounting the file system that way. The second doc is what I question, if there is specific mount instruction to make an option run properly. Is what I read in the second doc correct or not.

[Bill Hassell]

The recommended options for Oracle database files (not indexes, rollback logs, etc):

rw,nosuid,mincache=direct,convosync=direct,nodatainlog

All of these are on one line in fstab. You can then reduce the max buffer cache percentage.