PCI Express and Serial Attached SCSI

Maximizing Server Storage Performance

IT managers can optimize the capabilities of their server and storage components by combining SAS and PCI Express.

New serial technologies are emerging to overcome the bandwidth limitations of today’s parallel architectures and deliver highly scalable performance for next-generation systems. Serial Attached SCSI delivers a 3.0 Gb/sec per link data transfer rate, the unprecedented flexibility to deploy either low cost-per-gigabit Serial ATA drives or high-performance Serial Attached SCSI drives in the same system, point-to-point connections for high reliability, and highly scalable connectivity to more than 16,000 devices in a single domain. PCI Express offers similar benefits, with each PCI Express lane supporting 2.5 Gb/sec performance with scalability up to a 32-wide lane configuration.

By combining Serial Attached SCSI’s wide ports with PCI Express’ wide lanes, a system designer can maximize total storage system performance. For example, a 4-wide Serial Attached SCSI port will support bandwidth of up to 1200 Gb/sec for up to 16 hard disk drives. And with the Serial Attached SCSI initiator attached to a PCI Express 8-wide lane, the entire data path through the system will be optimized with bandwidth to spare.

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