Chapter 2. Architecture and technical overview
93
Various SPCN cables are available. Table 2-27 lists the SPCN cables to satisfy various length
requirements.
Table 2-27 SPCN cables
2.11 External disk subsystems
This section describes the following external disk subsystems that can be attached to the
Power 770 and Power 780:
EXP30 Ultra SSD I/O Drawer. (FC EDR1 CCIN 57C3)
EXP12S SAS Expansion Drawer (FC 5886)
EXP24S SFF Gen2-bay Drawer for high-density storage (FC 5887)
TotalStorage EXP24 Disk Drawer (FC 5786)
IBM System Storage
2.11.1 EXP30 Ultra SSD I/O Drawer
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 cache, high-performance SAS controllers.
Figure 2-32 on page 94 shows a picture of the drawer.
Ultra high levels of performance are provided without using any PCIe slots on the
server in an ultra dense packaging design. 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 probably be slowed until the controller pairing is
re-established. Each controller is connected to a GX++ PCIe adapters in a server (for
example the GX++ dual port (FC 1914) over a PCIe x8 Cable as shown previously. Usually
both controllers are attached to one server, but each controller can be assigned to a separate
server, partition, or VIOS. Active/Active capability is supported assuming at least two RAID
arrays. The controllers provide RAID 0, RAID 5, RAID 6, and RAID 10 for AIX, Linux, VIOS.
AIX, Linux, and VIOS also provide OS mirroring (Logical Volume Manager, LVM).
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
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