SCSI Solutions White Paper - HP-UX

1.3 Futures

The industry has agreed due to various problems inherent in parallel bus technology that there

will be no progression of parallel SCSI beyond Ultra320. The parallel bus has inherent

electrical issues with the timing of the various bits being transferred in parallel (skew),

electromagnetic interference among the various parallel lines (crosstalk), and related issues

which become increasingly difficult to address at higher speeds. As a result the SCSI Trade

Association (STA) agreed that Ultra640 technology will not be pursued. Instead, serial

technologies such as SAS, SATA, Fibre Channel, and iSCSI will provide the next generation of

products beyond Ultra320 SCSI.

Note: SCSI technology continues to expand into the serial realm. pSCSI solutions will continue to be

provided and supported for years to come, and will overlap with the solutions that future SCSI technologies

provide.

For additional information on the SCSI Specifications and technology development, go to