Chapter 2. Architecture and technical overview
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2.12 External disk subsystems
This section describes the following external disk subsystems that can be attached to the
Power E850C system:
EXP24S SFF Gen2-bay Drawer for high-density storage (#5887)
IBM System Storage®
2.12.1 EXP24S SFF Gen2-bay Drawer
The EXP24S SFF Gen2-bay Drawer (#5887) is an expansion drawer with twenty-four 2.5-inch
small form-factor SAS bays. The EXP24S supports up to 24 hot-swap SFF-2 SAS HDDs or
SSDs. It uses only 2 U (2 EIA units) of space in a 19-inch rack. The EXP24S includes
redundant ac power supplies and uses two power cords.
To further reduce possible single points of failure, EXP24S configuration rules consistent with
previous Power Systems are used. All Power operating system environments that are using
SAS adapters with write cache require the cache to be protected by using pairs of adapters.
Note:
The EXP30 Ultra SSD Drawer (#EDR1 or #5888), the EXP12S SAS Disk Drawer
(#5886), and the EXP24 SCSI Disk Drawer (#5786) are not supported on the
Power E850C server.
IBM offers a 1U multimedia drawer that can hold one or more DVD drives, tape drives,
or RDX docking stations. The 7226-1U3 is the most current offering. The earlier
7216-1U2 and 7214-1U2 are also supported. Up to six of these multimedia drawers can
be attached by using a PCIe SAS adapter.
Note: A maximum of 64 EXP24S drawers can be attached to the Power E850C server,
providing an extra quantity of 1536 disks.
Summary of Contents for E850C
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