IBM Redbooks ServeRAID-MR10i, User Manual

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1-4 Overview
controller can connect to drives directly. Simplified cabling between
devices is an additional benefit.
This controller is based on the LSISAS1078 RAID On-a-Chip (ROC)
device. This device is compliant with the Fusion-MPT architecture and
provides a PCI Express x8 interface.
The controller integrates eight high-performance SAS/SATA II PHYs and
a PCI Express bus master DMA core. Each of the eight PHYs is capable
of 3.0 Gbit/s SAS link rates and 3.0 Gbit/s SATA II link rates.
The LSISAS1078 RAID-on-chip (ROC) device provides an eight-lane,
2.5-Gbit/s PCI Express host interface, eight 3.0 Gbit/s SAS ports or
SATA ports, and a full-featured, hardware-based RAID implementation.
The LSISAS1078 ROC device integrates a high-speed DDR/DDR2
SDRAM interface with a hardware RAID assist engine for parity
calculations. The LSISAS1078 ROC device provides the maximum
benefits of a RAID system and enables you to configure the system to
satisfy your system requirements.
The LSISAS1078 ROC device increases system performance and
provides fault-tolerant data storage. The LSISAS1078 ROC supports
data striping across multiple disks, which reduces disk access time
because multiple disks simultaneously read or write data. The
LSISAS1078 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 ServeRAID-MR10i controller supports the SAS protocol as
described in the
Serial Attached SCSI Standard , version 1.1 . The
controller also supports 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 controller supports the following
SATA II features:
•
3 Gbit/s SATA II
•
Staggered spin-up
•
Hot plug