Your performance assumptions are flawed. U320 SCSI allows 320MB/sec for the entire SHARED SCSI BUS (15 drives). S-ATA gives you 150MB/sec to EACH drive; the SATA controllers support a Direct Port Access (DPA) mode that allows DMA transactions to proceed simultaneously to all drives. With the new Seagate and WD drives having the larger 8MB cache in each drive we will see decent per drive performance and in large drive arrays (>8 drives) the performance should beat the pants off of SCSI.
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Your performance assumptions are flawed. U320 SCSI allows 320MB/sec for the entire SHARED SCSI BUS (15 drives). S-ATA gives you 150MB/sec to EACH drive; the SATA controllers support a Direct Port Access (DPA) mode that allows DMA transactions to proceed simultaneously to all drives. With the new Seagate and WD drives having the larger 8MB cache in each drive we will see decent per drive performance and in large drive arrays (>8 drives) the performance should beat the pants off of SCSI.