IBM Power 750 Technical Overview And Introduction page 104

If the server must be connected to two FC EDR1, connect each controller to a separate GX++
adapter, as shown on figure Figure 2-27.
Power 750
or
Power 760
Figure 2-27 Connection between two FC 1914 and two FC EDR1
EXP30 drawer connection to EXP24S drawer
Two EXP24S disk drawers (FC 5887) can be directly attached to an EXP30 (FC EDR1)
drawer, running AIX, IBM i, and Linux. Up to 48 additional SAS disks enhance the disk
capacity up to 43.2 TB. This combination (one EXP30 Ultra Drawer and two EXP24S
drawers) provides a maximum capacity of 54.8 TB capacity.
Use both T1 connector locations of the EXP30 drawer to connect an EX SAS cable to the two
T1 connector locations of the first EXP24S drawer. If you want to attach a second EXP24S
drawer, connect both T2 connector locations of the EXP30 drawer with the two T1 connector
location of the second EXP24S drawer.
Support:
IBM i 7.1 TR6 also supports attaching downstream EXP24S drives, but has a maximum
of one downstream EXP24S drawer and therefore a maximum of up to 24 additional
SAS disks.
The previous model of the EXP30 drawer (FC 5888) does not support the attachment of
an EXP24s drawer.
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IBM Power 750 and 760 Technical Overview and Introduction
T1
8X
FC 1914
8X
T2
T1
8X
FC 1914
8X
T2
FC EDR1
ERM - C1
PSU
P1
T1 T2
FC EDR1
PSU
P1
T1
PCIe Gen2 8X cables
PCIe Gen2 8X
cables
ERM - C2
T3 T1 T2 T3
ERM - C1 ERM - C2
T2 T3 T1 T2
PSU
P2
PSU
P2
T3