Chapter 2. Architecture and technical overview 89
Figure 2-30 SPCN cabling example
Various SPCN cables are available. Table 2-26 shows the available SPCN cable options to
satisfy various length requirements.
Table 2-26 SPCN cables
2.10 External disk subsystems
This section describes the external disk subsystems that can be attached to the Power 720
and Power 740:
EXP30 Ultra SSD I/O drawer (FC EDR1, CCIN 57C3)
EXP24S SFF Gen2-bay drawer for high-density storage (FC 5887)
EXP12S SAS expansion drawer (FC 5886)
IBM System Storage
Later sections give detailed information about the various external disk subsystems.
2.10.1 EXP30 Ultra SSD I/O drawer
The EXP30 Ultra SSD I/O drawer (FC EDR1) is a 1U high I/O drawer providing 30 hot-swap
SSD bays and a pair of integrated large write caches, high-performance SAS controllers
without using any PCIe slots on the POWER7+ server. The two high-performance, integrated
SAS controllers each physically provide 3.1 GB write cache. Working as a pair, they provide
mirrored write cache data and controller redundancy. The cache contents are designed to be
protected by built-in flash memory in case of power failure. If the pairing is broken, write cache
is not used after existing cache content is written out to the drive, and performance will
Feature code Description
6001
a
Power Control Cable (SPCN) - 2 meter
6006 Power Control Cable (SPCN) - 3 meter
6008
a
a. Supported, but no longer orderable
Power Control Cable (SPCN) - 6 meter
6007 Power Control Cable (SPCN) - 15 meter
6029
a
Power Control Cable (SPCN) - 30 meter
I/O drawer
J15
J16
I/Odrawer
J15
J16
Power 720
or
Power 740
system unit
1
0
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