Bull Cedoc Novascale R422, Installation And User Manual

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1-6
NovaScale R422 Installation and User's Guide
1-4 1U Twin: System Notes
As a 1U Twin con fi guration, the NovaScale R422/R422-INF is a unique server system.
With two system boards incorporated into a single chassis, there are several points you
should keep in mind.
System Power
A single power supply is used to provide the power for both server boards. Each
serverboard however, can be shut down independently of the other with the power button
on its own control panel.
Although they share a common power supply, the I
2
C signals used for power supply
monitoring are received by the primary serverboard only. (When viewed from the front
of the chassis, the serverboard on the left is referred to as the primary board and the
serverboard on the right as the secondary).
SATA Backplane/Drives
As a system, the NovaScale R422/R422-INF supports the use of four SATA drives. The
SATA backplane works as a single backplane divided into two sections. This means that
while a single power connector is used and functions such as overheating apply to both
sections together, each pair of SATA drives is logically connected to its own serverboard.
Consequently, RAID setup is limited to a two-drive scheme (RAID cannot be spread across
all four drives).
1-5 Contacting Bull S.A.S.
For details on contacting Bull S.A.S go to http://support.bull.com