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One factor that may inhibit your ability to get good bench numbers from around the 'net are other system limitations. The SPD bus, for instance, is way slower than what modern hard drives/RAID cards can deliver. A 32 bit, 33MHz PCI bus in a PC will top out at around 110MB/s transfer rate as that's all the bus can do. 64 bit, 66 MHz ups that. So does using PCI-X or PCI-Express. Most modern drives can burst-transfer at their spec (320MB/s, for instance), but can't sustain anywhere near that. Sustained transfer speeds for a single are still topping out around 80MB/s. Anyway, I've run RAID5 on iSeries machines for many, many moons. It works and is decently cost-effective (as far as one can say anything disk-related on an iSeries is 'cost effective'). I would, though, recommend you use the 2780. Cache is king. :)
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