Best Performance settings for filepro

[Fairlight]

Only Enrique Arredondo would say something like:
> I'm configuring my new set of drives on a new machine to run OSR 5 and 
> filepro , and I noticed there's setting on the RAID controller that's 
> called *stripe size* (stripe Depth) which is 64Kb by default, If I make it 
> smaller , based on the fact that 100+ filepro users do many random things, 
> would it make the machine faster? How about a 4Kb stripe size ?

Disclaimer:  I am not a RAID expert.  In fact, I anticipate 20 corrections
to what I'm about to say if I'm wrong.  :)

I'd leave the stripe depth alone.  It's often slower to deal with smaller
sizes than it is larger sizes.  Witness the performance boost in jumping
NFS packet sizes from 1024 or even 4096 to 8192.  It's substantial.

I think you may be looking at the scenario a bit oddly based on your 100
users doing different things.  I don't think that setting has a bearing on
your scenario.  I could be wrong, so someone more knowledgeable please jump
in.  :)

> One more thing the cache policy, Should it be Cached I/O or Direct I/O ?

Cached.  I'm assuming (we know what happens THEN though!) that Direct
would mean you'd be sitting on disk-wait states for -every- write, rather
than having it buffered.  If that's the case, it would slow your system
significantly.

> and what about READ policy : Read-Ahead, Normal or Adaptive.

Read-ahead, to the best of my knowledge.  That's supposed to be a speed
increase.

mark->
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