Chapter 2. Architecture and technical overview 79
Figure 2-20 details the split backplane.
Figure 2-20 Internal topology overview for FC 5618 backplane with split backplane feature FC EJ02
2.8.3 Media bays
The Power 720 and Power 740 each offer a slim media bay to support a slim SATA DVD
device. Direct dock and hot-plug of the DVD media device are supported. In addition a
half-high bay is available to support an optional SAS tape drive or removable disk drive.
The DVD drive and media device do not have an independent SAS adapter and so cannot be
assigned to an LPAR independently of the HDD/SSDs in the system.
2.9 External I/O subsystems
This section describes the external 12X I/O subsystems that can be attached to the
Power 720 and Power 740, listed as follows:
PCI-DDR 12X Expansion Drawer (FC 5796)
12X I/O Drawer PCIe, small form factor (SFF) disk (FC 5802)
12X I/O Drawer PCIe, No Disk (FC 5877)
Each processor module feeds one GX++ adapter slot. On the Power 720, there is one GX++
slot available, and on the Power 740, there can be one or two, depending on whether one or
two processor modules are installed.
Note: In a Power 720 and Power 740 with a split backplane, SSDs and HDDs can be
placed in a set of three disks, but no mixing of SSDs and HDDs within a split configuration
is allowed. IBM i does not support split backplane.
Disk #6
Disk #5
Disk #4
Disk #3
Disk #2
Disk #1
Slim DVD
Tape Drive
Integrated
SAS Adapter
P7IOC
Integrated
SAS Adapter
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