IBM eServer OpenPower 720, Технический обзор и введение

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Chapter 2. Architecture and technical overview
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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
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.
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.
Connect the SCSI cable feature to the SCSI adapter
in rightmost slot (7) as shown below:
to 6-pack
backplanes
to 6-pack
backplanes
If a SCSI card is also placed in slot 4, wire as shown below:
SCSI cables FC 4257 SCSI cables FC 4257