Hard Disk Drive Support
Intel®
Server System SR1625UR TPS
50
Revision 1.5
Intel order number E47487-007
7.2.2.1
Active Midplane Architectural Overview
Figure 32. Active Midplane Architecture Diagram
7.2.2.2
x4 PCI Express* Card Edge Interfaces
Two x4 PCI Express* card edges are used to connect the active midplane to the hot-swap
backplane. The use of card edge connectors to the backplane eliminates all hard drive cabling.
7.2.2.3
LSI LSISAS1078 SAS Controller
The LSI LSISAS1078 ROC supports transfer rates of up to 3 GB/s on each SAS port. It
integrates a high-speed DDR/DDR2 SDRAM interface for Hardware RAID cache. It utilizes a
PCI Express* interface to provide transmission and reception rates of up to 10 GB/s over a x4
link.
7.2.2.4
Optional Hardware RAID Support
The active midplane supports options to provide full hardware RAID support. Options required
to enable hardware RAID support include an Intel
®
RAID Activation Key (Product Order Code –
AXXRAKSAS2) and installation of a Mini-DIMM (Product Order Code – AXXMINIDIMM512) for
Intel
®
RAID Cache support. To protect from data loss during an unexpected power loss event,
an Intel
®
RAID Smart Battery Backup module (AXXRSBBU3) is also supported. Hardware RAID
levels supported include 0, 1, 5, 10, 50, 6, and 60.
7.2.2.4.1
Intel
®
RAID Activation Key
The Intel
®
RAID Activation Key enables the full intelligent SAS Hardware RAID solution. The
activation key plugs directly into a connector (J1A10) on the midplane board. With no RAID
activation key installed, only SAS Software RAID levels 0, 1, and 10 are supported.
