Le Wed, 5 Oct 2011 08:44:11 -0700 vous écriviez:

>  I don't
> know how to watch actual IOPS or other more direct metrics.

Use the iostat command, something like 

iostat -mx 4

you'll have a very detailed report on disk activity. The percentage of
usage (last column to the right) might be interesting. Let it run for a
while and see if there's a pattern.

-- 
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Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |   <[email protected]>
                    |   +33 1 78 94 84 02
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