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HP 411508-B21 - Smart Array E200/128 BBWC Controller RAID Introduction Manual

Serial ata technology, 2nd edition.
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technology brief, 2nd edition
Introduction......................................................................................................................................... 2
Parallel ATA technology ....................................................................................................................... 2
Serial ATA technology.......................................................................................................................... 3
Low voltage differential signaling ....................................................................................................... 4
Signal integrity ................................................................................................................................ 4
SATA Performance ........................................................................................................................... 5
SATA devices .................................................................................................................................. 5
SATA/SAS interoperability................................................................................................................ 7
SATA topologies.................................................................................................................................. 8
Internal ........................................................................................................................................... 8
External .......................................................................................................................................... 8
Conclusion.......................................................................................................................................... 9
For more information.......................................................................................................................... 10
Call to action .................................................................................................................................... 10
SATA 1.5 Gb/s ........................................................................................................................... 5
SATA 1.5 Gb/s (with extensions) ................................................................................................... 5
SATA 3.0-Gb/s............................................................................................................................ 5
Cabling and connector ................................................................................................................. 6
Initiators ...................................................................................................................................... 6
Port multipliers ............................................................................................................................. 7
Targets........................................................................................................................................ 7

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   Summary of Contents for HP 411508-B21 - Smart Array E200/128 BBWC Controller RAID

  • Page 1

    Serial ATA technology technology brief, 2nd edition Introduction............................2 Parallel ATA technology ........................2 Serial ATA technology.......................... 3 Low voltage differential signaling ....................... 4 Signal integrity ..........................4 SATA Performance ........................... 5 SATA 1.5 Gb/s ........................... 5 SATA 1.5 Gb/s (with extensions) ....................5 SATA 3.0-Gb/s..........................

  • Page 2: Introduction, Parallel Ata Technology

    Introduction The parallel Advanced Technology Attachment (ATA) architecture has limitations that make it unsuitable as a long-term solution for direct-attached and network storage applications in the enterprise: short, bulky ribbon cables that impede airflow and are difficult to install; a large number of wires and high frequency signals that are prone to electrical interference;...

  • Page 3: Serial Ata Technology

    After the introduction of parallel ATA, its data transfer rate increased from 3 megabytes per second (MB/s) to 133 MB/s (Figure 2). ATA 100 and ATA 133 have the headroom to handle the sustained transfer rate of today's 7,200-RPM hard disk drives (HDDs) because the interface has to accommodate only one drive at a time.

  • Page 4: Low Voltage Differential Signaling, Signal Integrity

    Low voltage differential signaling SATA technology transmits signals in a single stream rather than in multiple parallel streams. SATA incorporates an low voltage differential (LVD) signaling scheme that uses two pairs of data lines to transmit and receive low-voltage signals (250 mV). The data is represented by the voltage potential between the two wires in each pair (Figure 3).

  • Page 5: Sata Performance, Sata 1.5 Gb/s, Sata 1.5 Gb/s (with Extensions), Sata 3.0-gb/s, Sata Devices

    SATA Performance The SATA specification was released in three parts: SATA 1.5 Gb/s, SATA 1.5 Gb/s with extensions, and SATA 3.0 Gb/s. The 10-year roadmap for Serial ATA allows it to scale eventually to 6.0 Gb/s. SATA 1.5 Gb/s The SATA specification was introduced with a maximum theoretical bandwidth of 1.5 Gb/s, or 150 MB/s, factoring 20 percent encoding overhead (see "Signal integrity").

  • Page 6: Cabling And Connector, Initiators

    Figure 5. Example of SATA devices in a domain. Cabling and connector SATA replaces the parallel ATA 40-pin connector and 18-inch long flat ribbon cable with a 7-pin connector (four signal lines and three ground lines) and a small diameter cable up to 1 meter long (Figure 6).

  • Page 7: Port Multipliers, Targets, Sata/sas Interoperability

    Port multipliers SATA port multipliers require host controllers that are port-multiplier-aware, such as SATA 1.5 Gb/s (with extensions) and SATA 3.0-Gb/s. Therefore, port multipliers are not compatible with original SATA 1.5 Gb/s controllers. However, port multipliers are compatible with SATA 1.5 Gb/s drives. Port multipliers can only link to SATA drives;...

  • Page 8: Sata Topologies, Internal, External

    SATA topologies The following internal and external topologies use a SATA controller only. However, the Serial ATA STP enables SAS controllers to communicate with SATA devices through expanders and, therefore, allows SATA drives to be deployed in a SAS domain. For information, refer to the technology brief “Serial Attached SCSI technology”...

  • Page 9: Conclusion

    Conclusion SATA overcomes the limitations of parallel ATA by providing thinner cabling, smaller connectors, lower voltage, and point-to-point signaling. Like its parallel predecessor, SATA will dominate the desktop market because it offers desktop reliability, functionality, and performance at a low cost. SATA technology is ideal for low-cost servers and non-mission critical server storage applications.

  • Page 10: For More Information, Call To Action

    Send comments about this paper to TechCom@HP.com. © 2005, 2007 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.

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