Ok I read it, infact I'll copy a chunk here, but this does not answer the question as to why the XStack sees the drives as 1.5 and NOT 3.0. How can this be configured? Am I losing half my available throughput?
SATA 3.0 Gbit/s
Soon after SATA/150's introduction a number of shortcomings were observed. At the application level SATA could only handle one pending transaction at a time like PATA. The SCSI interface has long been able to accept multiple outstanding requests and service them in the order which minimizes response time. This feature, Native Command Queuing (NCQ), was adopted as an optional supported feature for SATA 1.5 Gbit/s and SATA 3.0 Gbit/s devices.
First-generation SATA devices were at best a little faster than parallel ATA/133 devices. Subsequently, a 3 Gbit/s signaling rate was added to the Physical layer (PHY layer), effectively doubling maximum data throughput from 150 MB/s to 300 MB/s. SATA/300's transfer rate is expected to satisfy drive throughput requirements for some time, as the fastest desktop hard disks barely saturate a SATA/150 link. A SATA data cable rated for 1.5 Gbit/s will handle current second-generation SATA 3.0 Gbit/s drives without any loss of sustained and burst data transfer performance.
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Topic: Link Speeds (Read 12499 times)