Chapter 2. Architectural and technical overview
85
Figure 2-36 shows the components of an internal I/O drawer. The I/O riser cards provide
RIO-2 or 12x ports that are connected via cables to the I/O hubs located in the processor
books within the CEC.
Figure 2-36 I/O drawer internal view
Each I/O drawer is divided into two halves. Each half contains 10 blind-swap adapter slots
(3.3 V) and two Ultra3 SCSI 4-pack backplanes for a total of 20 adapter slots and 16 hot-swap
disk bays per drawer. The internal SCSI backplanes provide support for the internal drives
and do not have an external SCSI connector. Each half of the I/O drawer is powered
separately.
Additional I/O drawer configuration requirements:
A blind-swap hot-plug cassette is provided in each PCI-X slot of the I/O drawer. Cassettes
not containing an adapter are shipped with a plastic filler card installed to help ensure
proper environmental characteristics for the drawer. Additional blind-swap hot-plug
cassettes can be ordered: #4599, PCI blind-swap cassette kit.
All 10 adapter slots on each I/O drawer planar are capable of supporting either 64-bit or
32-bit 3.3 V based adapters.
For maximum throughout, use two I/O hubs per adapter drawer (one I/O hub per 10 slot
planar). This is also known as double-barrel cabling configuration (dual loop). Single-loop
configuration is supported for configurations with a large number of internal I/O drawers.
Table 2-21 compares features of the RIO-2 and 12x based internal I/O drawers.
Table 2-21 Internal I/O drawer feature comparison
Feature or Function
#5791 drawer
#5797, #5798 drawers
Connection technology
RIO-2
12x
Bandwidth per connection port
(4 ports per drawe)r
1.7 GBps sustained
2 GBps peak
5 GBps sustained
6 GBps peak
PCI-X (133 MHz) slots
10 per planar (20 total)
3 per planar (6 total)
DCA (2)
RIO-2 riser
card (2)
Planar board (2)
Chassis with 1 midplane board
PCI-X card in blind-swap hot plug cassette (2-20)
Blower (4)
DASD 4-pack (2 or 4)
I/O riser
card (2)
(4)
(20)
DCA (2)
RIO-2 riser
card (2)
Planar board (2)
Chassis with 1 midplane board
PCI-X card in blind-swap hot plug cassette (2-20)
Blower (4)
DASD 4-pack (2 or 4)
I/O riser
card (2)
(4)
(20)
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