Which hardware is recommended for a large Enterprise Cloud Solution?

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http://serverfault.com – we are struggling with some major questions about Cloud Computing. We are going to build a Large Enterprise Cloud Solution and would like to know in which configuration we would have a better redundancy/performance and cost efficient. Let me show you 2 examples which we're thinking it might be a good configuration to grow. Main Hardware: 42U Rack 2x Dell Force10 S4810 2x HP P2000 iSCSi (2x AW595A Controller), 12x 600GB SAS (RAID10) Example 1 for a configuration with many small nodes: 36x HP DL120 G7 (Xeon® E3-1240 @ 3.30GHz), 32GB RAM, 2x10GE, 2x240GB SSD (RAID1) Example 2 for a configur (HowTos)