IBM Power 780 User Manual

Chapter 2. Architecture and technical overview 83
2.9.2 Triple split backplane
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
Controller FC 5901. Figure 2-21 shows how the six disk bays are shared with the triple split
backplane mode. The PCI adapter that drives two of the six disks can be located in the same
Power 770 (or Power 780) CEC enclosure as the disk drives or adapter, even in a different
system enclosure or external I/O drawer.
Figure 2-21 Triple split backplane overview
Although SSDs are supported with a triple split backplane configuration, mixing SSDs
and HDDs in the same split domain is not supported. Also, mirroring SSDs with HDDs is
not possible.
2.9.3 Dual storage I/O Adapter (IOA) configurations
The dual storage IOA (FC 1819) configurations are available with either internal or external
disk drives from another I/O drawer. SSDs are not supported with this mode.
If this IOA is selected for an enclosure, selecting SAS cable FC 3686 or FC 3687 to support
RAID internal and external drives is necessary (Figure 2-22 on page 84). If this IOA is not
selected for the enclosure, the RAID supports only internal enclosure disks.
Option cable FC 1815 for 3 way split
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-E
Integrated
Controller
SAS A
Port
Expander
SAS B
Port
Expander
P7IOC
P7IOC
PCI-e 8x
PCI-e 8x
Integrated Obsidian
Controller
IO connections
Redriver
SAS 4x connector
Key = 2
Cadet-E
AI cable FC3679

IBM Power 780 Specifications

General

Brand	IBM
Model	Power 780
Category	Server
Language	English