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IBM Power 750 and 760 Technical Overview and Introduction
triple split backplane mode. The PCI adapter that drives two of the six disks can be located in
the same Power 750 or Power 760 system enclosure or in an external I/O drawer.
Figure 2-15 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.
2.8.3 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 FC 1819 is selected, a SAS cable FC 3686 or FC 3687 to support RAID with internal and
external drives is necessary (Figure 2-16 on page 79). If this IOA is not selected for the
enclosure, the RAID supports only internal enclosure disks.
This configuration increases availability by using dual storage IOA or high availability (HA) to
connect multiple adapters to a common set of internal disk drives. It also increases the
performance of RAID arrays. The following rules apply to this configuration:
This configuration uses the 175 MB Cache RAID - Dual IOA Enablement Card (FC 5662).
Using the dual IOA enablement card, the two embedded adapters can connect to each
other and to all six disk drives, and also the 12 disk drives in an external disk drive
enclosure, if one is used.
The disk drives are required to be in RAID arrays.
There are no separate SAS cables required to connect the two embedded SAS RAID
adapters to each other. The connection is contained within the backplane.
I/O Planar
DASD Backplane
Hard Disk 2
Hard Disk 3
SAS Port
Expander
Hard Disk 4
Hard Disk 5
Hard Disk 6
SAS Port
Expander
Optical
Optical
Int. SAS Cnt.
Hard Disk 1
Integrated
SAS
Controller
Integrated
SAS
Controller
External SAS Port
P7IOC
P7IOC
Hard Disk 1
Hard Disk 2
Hard Disk 3
Hard Disk 4
Hard Disk 5
Hard Disk 6
Front View
SAS Adapter