LSI MegaRAID SAS User Manual

LSI Corporation
- 10 -
6Gb/s MegaRAID SAS RAID Controllers User Guide
August 2012
Chapter 1: Overview
Configuration Scenarios
 High-end external SAS/SATA configuration: This configuration is for external connectivity using SATA drives,
SATA II drives, SATA III drives, SAS drives, or combinations of SATA and SAS drives. External enclosure management
is supported through in-band, SCSI-enclosed storage. The configuration must support STP and SMP.
The following figure shows a direct-connect configuration. The Inter-IC (I
2
C) interface communicates with peripherals.
The external memory bus provides a 32-bit memory bus, parity checking, and chip select signals for pipelined
synchronous burst static random access memory (PSBRAM), nonvolatile static random access memory (NVSRAM), and
Flash ROM.
Figure 1 Example of an LSI SAS Direct-Connect Application
The following figure shows an example of a SAS RAID controller configured with an LSISASx12 expander that is
connected to SAS drives, SATA III drives, or both.
Figure 2 Example of an LSI SAS RAID Controller Configured with an LSISASx12 Expander
Flash ROM/
SAS
PCI Express
RAID Controller
SAS/SATA III Device
32-Bit Memory
Address/Data
Bus
PSBRAM/
I
2
C
SAS/SATA III Device
SAS/SATA III Device
SAS/SATA III Device
PCI Express Interface
NVSRAM
I
2
C
Interface
LSISASx12
Flash ROM/
NVSRAM/
SRAM
I
2
C/UART
LSISASx12
PCI Express Interface
8
SRAM
SRAMSDRAM
Peripheral
Bus
72-bit DDR/DDR2
with ECC
Interface
LSISAS2108
PCI Express to SAS ROC
SAS
RAID Controller
Expander
Expander

LSI MegaRAID SAS Specifications

General

RAID Levels	0, 1, 5
Ports	8
Form Factor	Low Profile
Operating Systems Supported	Windows, Linux, VMware
SAS Ports	8
BBU Support	Optional
Operating Temperature	0°C to 55°C