Lenovo ServeRAID M1115 User Manual page 22

The controller integrates eight high-performance SAS/SATA 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 6.0 Gb/s SATA III link rates.
The LSISAS2008 ROC device provides an eight-lane, 5-Gb/s
PCI Express host interface, eight 6.0 Gb/s SAS or 6.0 Gb/s SATA ports,
and a full-featured, hardware-based RAID implementation. The
LSISAS2008 ROC device provides the maximum benefits of a RAID
system and enables you to configure the system to satisfy your system
requirements.
The LSISAS2008 ROC device increases system performance and
provides fault-tolerant data storage. The LSISAS2008 ROC device
supports data striping across multiple disks, which reduces disk access
time because multiple disks simultaneously read or write data. In
addition, the LSISAS2008 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 disk 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 controller supports the SAS protocol as described in the Serial
Attached SCSI Standard, version 2.0. In addition, it supports the
Serial ATA III (SATA III) protocol defined by the Serial ATA Revision 3.0,
and the Serial ATA III; Extension to the Serial ATA Specification,
Version 3.0. SATA III is an extension to SATA 2.0. The controller supports
the following SATA III features:
•
6 Gb/s SATA III
•
Staggered spin-up
•
Hot plug
•
Native command queuing
•
Activity and fault indicators for each PHY
•
Port Selector (for dual-port drives)
Each port on the ServeRAID-M1115 controller supports SAS devices,
SATA devices, or both using SSP, SMP, STP, and SATA. SSP enables
communication with other SAS devices. SATA enables the controller to
communicate with other SATA devices.
Technical Description 1-5