Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 26
SAS Serial SCSI Protocol SSP, which enables communication
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SAS technology brings a wealth of options and flexibility with the use of SAS devices, Serial ATA (SATA) II devices, and SSD devices within the same storage infrastructure. These devices bring individual characteristics that make each one a more suitable choice depending on your storage needs. MegaRAID gives you the flexibility to combine these two similar technologies on the same controller, within the same enclosure, and in the same virtual drive. Note: It is recommended that you carefully assess any decision to mix SAS drives and SATA drives within the same virtual drives. Although you can mix drives, Lenovo strongly discourages the practice. This recommendation applies to both HDDs and SSDs. The MegaRAID SAS RAID controllers are based on the first-to-market SAS IC technology and proven MegaRAID technology. As second-generation PCI Express RAID controllers, the MegaRAID SAS RAID controllers address the growing demand for increased data throughput and scalability requirements across midrange and enterpriseclass server platforms. Lenovo offers a family of MegaRAID SAS RAID controllers addressing the needs for both internal and external solutions. The SAS controllers support the ANSI Serial Attached SCSI standard, version 1.1. In addition, the controller supports the SATA II protocol defined by the Serial ATA specification, version 1.0a. Supporting both the SAS and SATA II interfaces, the SAS controller is a versatile controller that provides the backbone of both server environments and high-end workstation environments. Each port on the SAS RAID controller supports SAS devices, SATA II devices, or SSD devices using the following protocols: • SAS Serial SCSI Protocol (SSP), which enables communication with other SAS devices • SATA II, which enables communication with other SATA II devices • Serial Management Protocol (SMP), which communicates topology management information directly with an attached SAS expander device • Serial Tunneling Protocol (STP), which enables communication with a SATA II device through an attached expander 1-2 Overview
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