7311 I/O Drawer's Rio-2 Cabling - IBM OpenPower 720 Technical Overview And Introduction

7311 Model D20 internal SCSI cabling
A 7311 Model D20 supports hot-swappable disks using two 6-pack disk bays for a total of 12
disks. Additionally, the SCSI cables (FC 4257) are used to connect a SCSI adapter (that can
have various features) in slot 7 to each of the 6-packs, or two SCSI adapters, one in slot 4 and
one in slot 7 (see Figure 2-9 on page 31).
Figure 2-9 7311 Model D20 internal SCSI cabling
Note: Any 6-pack and the related SCSI adapter can be assigned to a single partition. If
one SCSI adapter is connected to both 6-packs, both 6-packs can be assigned only to the
same partition.

2.8.3 7311 I/O drawer's RIO-2 cabling

As described in the 2.8, "External I/O subsystem" on page 30, you can connect up to four I/O
drawers in the same loop and up to eight I/O drawers to the OpenPower 720 system.
Each RIO-2 port can operate at 1 GHz in bidirectional mode and is capable of passing data in
each direction on each cycle of the port. Therefore, the maximum data rate is 4 GB/s per I/O
drawer in double barrel mode.
There is one default primary RIO-2 loop in any OpenPower 720 system. This feature provides
two remote I/O ports for attaching up to four 7311 Model D20 I/O drawers to the system in a
single loop. The optional RIO-2 expansion card can be used to increase the number of I/O
drawers connected to one OpenPower 720 system, and the same rules of the default RIO-2
loop must be considered. Figure 2-10 on page 32 shows how you could logically connect four
I/O drawers to one OpenPower 720 system. Actual cables should be routed according to
installation instructions.
Connect the SCSI cable feature to the SCSI adapter
in rightmost slot (7) as shown below:
to 6-pack
backplanes
If a SCSI card is also placed in slot 4, wire as shown below:
SCSI cables FC 4257
Chapter 2. Architecture and technical overview
to 6-pack
backplanes
SCSI cables FC 4257
31