Monitoring Interval Granularity (iostat)

I hope this is not too off-topic, but here goes.

I have a linux system (RH AS 3.0) running Oracle 9iR2.
 I'm monitoring disk usage on our RAID arrays by
executing iostat and capturing the output to a file. 
Eventually, I'd like to plot the data out and see how
the disks are performing.

I'm currently executing iostat every 5 minutes.  How
would one determine the interval granularity?  I guess
it would depend on a lot of things.  

So for example, if it's very busy take an iostat
snapshot every 5 or 10 minutes, say.  If it's lightly
loaded, take a snapshot every minute perhaps?

Any thoughts?


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