Specifications

82 IBM Power 770 and 780 Technical Overview and Introduction
2.9.1 Dual split backplane mode
Dual split backplane mode offers two set of three disks and is the standard configuration. If
desired, one of the sets can be connected to an external SAS PCIe or PCI-X adapter if #1819
is selected. Figure 2-23 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 2-23 Dual split backplane overview
Dual storage
IOA with
internal disk
Yes None None N/A Internal SAS port
cable (#1815) cannot
be used with this or
HA RAID
configuration.
Dual storage
IOA with
internal disk
and external
disk enclosure
Yes Requires an
external disk
enclosure
(#5886)
Internal SAS
port (#1819)
SAS cable
assembly for
connecting
to an
external SAS
drive
enclosure
#3686 or
#3687
#3686 is a 1-meter
cable.
#3687 is a 3-meter
cable.
SAS
subsystem
configuration
#5662 External SAS
components
SAS port
cables
SAS cables Notes
P7IOC
Integrated
SAS Adapter
P7IOC
DVD
DASD
DASD
DASD
VSES
Redriver
Integrated
SAS Adapter
Integrated
SAS Adapter
Redriver
SAS Port Exp.
A
SAS Port Exp.
B
External Port