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FatTwin F627R3-RTB+/R72B+ User's Manual
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Fat Twin: System Notes
As a Fat Twin confi guration, the FatTwin F627R3-RTB+/R72B+ is a unique server
system. With eight system boards incorporated into a single chassis acting as eight
separate nodes, there are several points you should keep in mind.
Nodes
Each of the four serverboards act as a separate node in the system. As independant
nodes, each may be powered off and on without affecting the others. In addition,
each node is a hot-swappable unit that may be removed from the front of the chassis.
Note: A guide pin is located between the upper and lower nodes on the inner chassis
wall. This guide pin also acts as a "stop" when a node is fully installed. If too much
force is used when inserting a node this pin may break off. Take care to slowly slide
a node in until you hear the "click" of the locking tab seating itself.
System Power
Four 1280 Watt power supplies are used to provide the power for all serverboards.
Each serverboard however, can be shut down independently of the other with the
power button on its own control panel.
SAS/SATA Backplane/Drives
As a system, the FatTwin F627R3-RTB+/R72B+ supports the use of up to thirty-
two (32) SAS/SATA drives. Each of the eight backplanes in the system (one for
six drives and one for two for each node) works to apply system-based control for
power and fan speed functions, yet at the same time logically connects a set of
eight SAS/SATA drives to each backplane/serverboard. Consequently, RAID setup
is limited to an eight-drive scheme (RAID cannot be spread across all drives). See
the Drive Bay Installation/Removal section in Chapter 6 for the logical hard drive
and node confi guration.
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