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> > If you are IO-bound, you might want to consider using
> SSD.
> >
> > A single SSD could easily give you more IOPS than 16
> 15k SAS in RAID 10.
> 
> Are there any that don't risk your data on power loss, AND
> are cheaper
> than SAS RAID 10?
> 

Vertex 2 Pro has a built-in supercapacitor to save data on power loss. It's spec'd at 50K IOPS and a 200GB one costs around $1,000.