These SAS controllers are based on the LSISAS2108 RAID On-a-Chip (ROC) device or the LSISAS2008 PCI Express-SAS/SATA I/O Processor chip. These devices are compliant with the Fusion-MPT™ architecture and provides a PCI Express x8 interface.
Note: All of these RAID controllers provide an x8 PCI Express 2.0 interface.
The LSISAS2108 ROC device provides an eight-lane, 5-Gb/s PCI Express host interface, eight 6.0 Gb/s SAS ports or eight 3.0 Gb/s SATA ports, and a full-featured, hardware-based RAID implementation. In addition, it integrates a high-speed DDR/DDR2 800 MHz SDRAM interface with a hardware RAID assist engine for parity calculations. The LSISAS2108 ROC device provides the maximum benefits of a RAID system and enables you to configure the system to satisfy your system requirements.
The LSISAS2108 ROC device increases system performance and provides fault-tolerant data storage. The LSISAS2108 supports data striping across multiple drives, which reduces drive access time because multiple drives simultaneously read or write data. The LSISAS2108 ROC device backs up data with either data mirroring or a parity block. Either backup method enables you to recover lost data in the event of a drive failure. You can select the data backup method that best suits your needs. A hardware RAID assist exclusive-OR (XOR) engine speeds parity generation and checking and reduces system-access times.
The SAS RAID controllers integrate eight high-performance SAS/SATA II PHYs and a PCI Express bus master DMA core. Each of the eight PHYs is capable of 6.0 Gb/s SAS link rates and 3.0 Gb/s SATA II link rates.
These devices adhere to the PCI Express Specification, Revision 2.0. The PCI Express software is backward compatible with previous revisions of the PCI bus and PCI-X bus.
The SAS RAID controllers support the SAS protocol as described in the Serial Attached SCSI Standard, version 2.0. The controllers also support the Serial ATA II (SATA II) protocol defined by the Serial ATA Specification, Version 1.0a and the Serial ATAII; Extension to the Serial ATA Specification, Version 1.1. SATA II is an extension to SATA 1.0a. In addition, the SAS RAID controllers support the following SATA II features:
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