Setting Essbase to Direct I/O Question

Hi!
I am trying to configure my only (already existing) database to use direct I/O instead of buffered.
After I have changed the settings and stopped and started the application the outline is empty and any access (smart view or excel add-in) denied. Changing back solves the problem.
The environment is a unix box with solaris 10.
Any experience on how to set this properly? (i.e. do I need to re-start the server)
E

Amarnath,
Can you speak about what kind of speed issue you are trying to address and what kind of improvements you are hoping to gain?
I would recommend other factors be looked at before changing this option. You would normally want to take a holistic approach for performance reviewing your outline order, calculation scripts, business process at times (sometimes people do ask for unreasonable things), utilization of disks -- are there "hot" disks that are always busy in an array, are cache's in a SAN being fully utilized. More invasive optimizations may even involve dropping a dimension where the business process supports -- probably only worth looking at this if you have > 10 dimensions in a BSO app.
Back to your question, you should always prove out this type of option in a non-production environment try to understand what performance gains (if any) and get an idea of the cache changes you will need to make -- once Direct I/O is enabled you now have 3 Essbase caches Index, Data, and then Data File Cache (only for Direct IO). Assuming you are using 32-bit Essbase, AIX has a 1.7GB limit per individual application -- if you start giving several hundred MB of cache to the Essbase Cache's you can begin bumping up against the 1.7GB limit (you don't want to have this happen during production).
The AIX Server and Essbase Server do not require a restart for the direct I/O changes to take effect. You will need to involve your AIX administration team to have the filesystem setting changed and enacted -- they are best suited to recommend the proper procedures -- usually this involves shutting down any processes active on a given filesystem.
Regards,
-John

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