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Figure 2-8 Conceptual diagram of the 7311-D20 I/O drawer
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 29).
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 28, you can connect up to four I/O
drawers in the same loop and up to eight I/O drawers to the p5-550 system.
PC I-X Host
133 M H z,
64-bit PC I-X
P C I-X B ridge
1
2
6
6
4
4
/
/
1
1
3
3
3
3
Connect the SCSI cable feature to the SCSI adapter
in rightmost slot (7) as shown below:
to 6-pack
backplanes
B ridge
133 M H z, 64-bit PC I-X
P C I-X B ridge
4
5
6
3
6
6
6
6
4
4
4
4
/
/
/
/
1
1
1
1
3
3
3
3
3
3
3
3
If a SCSI card is also placed in slot 4, wire as shown below:
SCSI cables FC 4257
Chapter 2. Architecture and technical overview
R IO
7
6
4
/
1
3
3
to 6-pack
backplanes
SCSI cables FC 4257
29
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