Chapter 2. Architecture and technical overview
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Figure 2-28 shows two EXP24S drawers connected to one EXP30 drawer.
Figure 2-28 FC EDR1 drawer connection to two FC 5887 drawers
2.10.2 EXP24S SFF Gen2-bay drawer
The EXP24S SFF Gen2-bay drawer (FC 5887) is an expansion drawer that supports up to 24
hot-swap 2.5-inch SFF SAS HDDs on POWER6, , POWER7, or
servers in 2U of 19-inch rack space.
The SFF bays of the EXP24S differ from the SFF bays of the POWER7 or
system units or of the 12X PCIe I/O Drawers (FC 5802 or 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 or system unit or of the 12X PCIe I/O Drawers.
The EXP24S SAS ports are attached to a PCIe SAS adapter or pair of adapters. The
EXP24S can also be attached to an embedded SAS controller in a server with an embedded
SAS port or to the integrated SAS controllers in the EXP30 Ultra SSD I/O Drawer. The SAS
controller and the EXP24S SAS ports are attached using the appropriate SAS Y or X or EX
cables.
The following internal SAS adapters support the EXP24S:
PCIe 380 MB Cache Dual - x4 3 Gb SAS RAID Adapter (FC 5805, CCIN 574E)
PCIe Dual port x4 SAS adapter (FC 5901, CCIN 57B3)
PCIe 380 MB Cache Dual - x4 3 Gb SAS RAID adapter (FC 5903, CCIN 574E)
PCIe2 1.8 GB Cache RAID SAS adapter Tri-Port 6 Gb (FC 5913, CCIN 57B5)
PCIe2 RAID SAS adapter Dual-Port 6 Gb (FC ESA1, CCIN 57B4)
The SAS disk drives that are contained in the EXP24S SFF Gen2-bay Drawer are controlled
by one or two PCIe SAS adapters that are connected to the EXP24S through SAS cables.
The SAS cable varies, depending on the adapter being used, the operating system being
used, and the protection you want.
ERM - C1
PSU
P2
FC EDR1
PSU
P1
T2
T3
ERM - C2
T2
T3
PSU
P1
ERM - C1
T2
T3
ERM - C2
T2
T3
PSU
P2
Second FC 5887 drawer
* SSDs only
* HDDs only
* HDDs only
PSU
P1
ERM - C1
ERM - C2
PSU
P2
First FC 5887 drawer
EX SAS Cables
EX SAS Cables
T1
T2
T3
T2
T3
T1
T1
T1
T1
T1