Chapter 1. General description 19
The SFF bays of the EXP24S are different from the SFF bays of the POWER7 and
POWER7+ system units or 12X PCIe I/O drawers (FC 5802 and FC 5803). The EXP24S uses
Gen2 or SFF-2 SAS drives that physically do not fit in the Gen1 or SFF-1 bays of the
POWER7 and POWER7+ system unit or 12X PCIe I/O Drawers. The EXP24S includes
redundant A/C power supplies and two power cords.
Figure 1-7 shows the EXP24S Gen2-bay drawer.
Figure 1-7 EXP24S SFF Gen2-bay drawer (FC 5887)
1.6.6 EXP12S SAS drawer
The EXP12S SAS drawer (FC 5886) is a 2 EIA drawer and mounts in a 19-inch rack. The
drawer can hold either SAS disk drives or SSD. The EXP12S SAS drawer has twelve 3.5-inch
SAS disk bays with redundant data paths to each bay. The SAS disk drives or SSDs
contained in the EXP12S are controlled by one or two PCIe or PCI-X SAS adapters
connected to the EXP12S with SAS cables.
FC 5886 can also be directly attached to the SAS port on the rear of the Power 720 and
Power 740, providing a low-cost disk storage solution. When used this way, the imbedded
SAS controllers in the system unit drive the disk drives in EXP12S. A second unit cannot be
cascaded to a FC 5886 attached in this way.
Figure 1-8 shows the EXP12S SAS drawer.
Figure 1-8 EXP12S SAS drawer (FC 5886)
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