Following this last install, we noticed that our HP-UX 11.31 IA64 servers were using a lot of system memory. Over half of the available memory was being eaten up by sys memory and file cache. We determined that the default settings for file cache were way to high. So, we made some adjustments.
The filecache_min and filecache_max kernel parameters are the ones to check. These should be tuned to leave more memory for Oracle. You can also mount the file system with direct IO which bypasses file buffer cache. If you are using file system for your Oracle datafiles then you want those mount points mounted with direct IO.
So, we solved it by setting constant values for filecache_min and max instead of taking the default %. By lowering them significantly, we were able to give more memory back to Oracle and the other applications.
We still have quite a bit of sys memory being utilized. However, the filecache issue is solved. I'll update this post if we figure out why so much sys memory is utilized. Or, it could be "just the way it is".
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