Remember Neil, they always say their numbers are based on a maxed system and anything less, "might" offer slightly different results.
I still think a 4 drive system mirrored is the way to go.
Thanks for the heads up. Wonder if IBM have checked this in the Lab or if the poor performance in that configuration is only on an 8xx system and not a 520. If the performance is that bad on a 520 there's obviously something seriously wrong with the 3 disk RAID setup and if they can't improve on that they shouldn't be selling systems that way.
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