4405ch02 Architecture and technical overview.fm Draft Document for Review May 28, 2009 1:59 pm
52 IBM Power 570 Technical Overview and Introduction
2.10.3 7311 Model D20 I/O drawer
The 7311 Model D20 I/O drawer must have the RIO-2 loop adapter (FC 6417) to be
connected to the 570 system. The PCI-X host bridge inside the I/O drawer provides two
primary 64-bit PCI-X buses running at 133 MHz. Therefore, a maximum bandwidth of 1 GBps
is provided by each of the buses.
Figure 2-16 shows a conceptual diagram of the 7311 Model D20 I/O drawer subsystem.
Figure 2-16 Conceptual diagram of the 7311-D20 I/O drawer
7311 Model D20 internal SCSI cabling
A 7311 Model D20 supports hot-swappable SCSI Ultra320 disk drives 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 (any of 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 2-17.)
Figure 2-17 7311 Model D20 internal SCSI cabling
Note: Any 6-packs and the related SCSI adapter can be assigned to a logical partition (for
example, the two partitions can be two Virtual I/O server partitions). If one SCSI adapter is
connected to both 6-packs, then both 6-packs can be assigned only to the same partition.
RIO 2
133 MHz,
64-bit PCI-X
PCI-X Bridge
1
3
PCI-X Host
Bridge
2
133 M Hz, 64-bit PCI-X
4
6
4
/
1
3
3
6
4
/
1
3
3
6
4
/
1
3
3
6
4
/
1
3
3
PCI-X Bridge
5
6
7
6
4
/
1
3
3
6
4
/
1
3
3
6
4
/
1
3
3
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
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