Lenovo ServeRAID M1115, User Manual, Page: 24 / 69

Configuration Scenarios 1-7
Figure 1.1 Example of a SAS Direct-Connect Application
The following figure shows an example of a ServeRAID controller
configured with an expander that is connected to SAS disks, SATA III
disks, or both.
Figure 1.2 Example of a ServeRAID Controller Configured with an
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
Expander
Flash ROM/
NVSRAM/
SRAM
I
2
C/UART
Expander
SAS/SATA III
Drives
PCI Express Interface
SAS/SATA
Drives
SAS/SATA III
Drives
SAS/SATA III
Drives
SAS/SATA III
Drives
8
SRAM
SRAM SDRAM
Peripheral
Bus
72-bit DDR/DDR2
with ECC
Interface
PCI Express to SAS ROC
SAS RAID Controller