82 IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
2.9.1 Dual split backplane mode
Dual split backplane mode offers two sets of three disks and is the standard configuration. If
you want, one of the sets can be connected to an external SAS PCIe or PCI-X adapter if
FC 1819 is selected. Figure 2-20 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, or vice versa.
Figure 2-20 Dual split backplane overview
D1 D2 D3
D4 D5 D6
Front view
0
1
0
1
0
1
0
1
0
1
D2
D3
D4
D5
D6
3 way split backplane pin = 1, drven = 0
Morris and Williams Assembly
D1
0
1
Battery card not populated
lanes 0,1
lanes 2,3
Raid = 0
VSES
DVD
Integrated
Controller
Integrated
Controller
SAS A
Port
Expander
SAS B
Port
Expander
P7IOC
P7IOC
PCI-e 8x
PCI-e 8x
Integrated Obsidian
Controller
IO connections
Redriver
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