IBM Power 720 Overview page 107

If the server needs to be connected to two FC EDR1, connect each controller to a separate
GX++ adapter, as shown on figure Figure 2-33.
Power 720
or
Power 740
Figure 2-33 Connection between two FC EJ03 and two EXP30 drawers
EXP30 drawer connection to EXP24S drawer
Two EXP24S disk drawer (FC 5887) can be directly attached to a 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 connectors locations of the EXP30 drawer to connect an EX SAS cable to the
two T1 connectors 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.
Notes:
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.
T1
8X
FC EJ03
8X
T2
T1
8X
FC EJ03
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
Chapter 2. Architecture and technical overview
PSU
P2
PSU
P2
T3
93