Dual Split Backplane Mode; Triple Split Backplane Mode - IBM Power 750 Technical Overview And Introduction

SAS subsystem FC 5662
configuration CCIN 2BC2
Dual storage IOA Yes
with internal disk
and external disk
enclosure

2.8.1 Dual split backplane mode

Dual split backplane mode offers two sets of three disks and is the standard configuration.
One set can be connected to an external SAS PCIe adapter if FC 1819 is selected.
Figure 2-14 shows how the six disk bays are shared with the dual split backplane mode.
Although solid-state drives (SSDs) are supported with a dual split backplane configuration,
mixing SSDs and hard disk drives HDDs in the same split domain is not supported. Also,
mirroring SSDs with HDDs is not possible.
I/O Planar
Int. SAS Cnt.
P7IOC
P7IOC
External SAS Port
Figure 2-14 Dual split backplane overview

2.8.2 Triple split backplane mode

The triple split backplane mode offers three sets of two disk drives each. This mode requires
an internal SAS Cable (FC 1815), a SAS cable (FC 3679), and a SAS controller, such as SAS
adapter FC 5901. Figure 2-15 on page 78 shows how the six disk bays are shared with the
External SAS SAS port
components cables
Requires an Internal SAS
external disk port (FC 1819)
drawer: SAS cable
FC 5887 or assembly for
FC 5886 connecting to
an external
SAS drive
enclosure
Integrated
SAS
Controller
Integrated
SAS
Controller
Hard Disk 1
Front View
Hard Disk 4
SAS cables Notes
FC 3686 or 1 meter cable is FC 3686.
FC 3687 3 meter cable is FC 3687.
SAS Port
Expander
SAS Port
Expander
Hard Disk 2
Hard Disk 5
Chapter 2. Architecture and technical overview
DASD Backplane
Optical Optical
Hard Disk 1
Hard Disk 2
Hard Disk 3
Hard Disk 4
Hard Disk 5
Hard Disk 6
Hard Disk 3
Hard Disk 6
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