Intel® Server System S7000FC4UR TPS SAS Riser
Revision 1.0
57
allows the user to enable the ROMB solution. During option ROM scan, an option to configure
the RAID is displayed. The following three sections provide an overview of the Intel ROMB
solution.
6.2.1.1 Intel
®
RAID Activation Key
The Intel
®
RAID Activation Key is a round one-wire serial EEPROM device programmed by LSI.
This key has a registration code which is required to enable the LSI Mega RAID* solution. The
RAID activation is an upgrade path from standard IR (Integrated RAID), which is the default
RAID solution.
6.2.1.2 DDR2 RAID DIMM
The LSI1078* provides a DDR2 SDRAM interface, which significantly improves RAID system
performance. The LSI1078* uses the high-speed DDR2 SDRAM interface to queue, organize,
and track RAID accesses independent of the host processor. The host processor can continue
to issue RAID writes for a given SAS Virtual Drive even when the SAS RAID channel is busy.
The LSI1078* queues the RAID write data in the DDR2 SDRAM until the connection is
available, and then performs the write. The host does not need not wait for the SAS channel
(only in Write Back mode). The ROMB solution only supports 667MHz registered ECC 240-pin
DIMM. Refer to the Intel
®
Server Platform S7000FC4UR Memory Qualification List for supported
memory. The LSI1078* supports single- or dual-ranked DIMMs but does not support quad-rank
configurations. The SAS riser will only work with 667MHz DIMMs.
6.2.1.3 Intel® RAID Smart Battery
The Intel
®
RAID Smart Battery keeps the contents of the DDR2 667MHz RAID DIMM preserved
if power drops below specifications. When the LSI1078* controller senses power has dropped
below specifications, it initiates a power fail sequence that safely puts the RAID DIMM into self-
refresh state. Standby power will be used to generate DIMM refresh power. In the absence of
any power from the power distribution board, the NiMH battery cells will be used for DIMM
refresh. The power subsystem generates enough of a delay to allow the LSI1078 to complete its
power fail sequence, even in the event of total system power loss. After the power fail sequence
is complete, additional logic keeps the RAID DIMM in self-refresh mode. When power is
restored, data from the RAID DIMM is safely written to the disk array. The ideal data-retention
time goal is 72 hours, but this may only be feasible using DIMMs with certain configurations.
6.2.2 FRU and SES
A 2K EEPROM (AT24C02) device provides 256 bytes of programmable Field-Replaceable Unit
(FRU) space. Like all Intel
®
server boards, this FRU is programmed during manufacturing to
contain the board version and serial number but may be programmed to meet integrator-specific
needs.
The SAS riser will implement SES connectivity to the SAS backplane in several ways. The
SFF8086 connectors will route the 2 SGPIO busses (SFF-8485) from the LSI1078* to the
Vittesse* controller on the SAS backplane through the SAS cables. The SFF8086* cable
headers will be strapped (SES signals: Contrl Type and Bckplne Type) to choose SGPIO over
2-wire method. In addition, a backup 3-pin header will allow cabling of dedicated SES SMB to
the BP.
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