Storage Enclosures - IBM DS8880 Series Introduction And Planning Manual

The main power area is at the rear of the expansion frame. The power system in
each frame is a pair of direct-current uninterruptible power supplies (DC-UPSs)
with internal batteries.

Storage enclosures

DS8880 version 8.2 and later integrates one of two types of storage enclosures:
High Performance Flash Enclosures Gen2 and standard drive enclosures.
High Performance Flash Enclosures Gen2 pair
The High Performance Flash Enclosure Gen2 is a 2U storage enclosure that is
installed in pairs.
The High Performance Flash Enclosure Gen2 pair provides two 2U storage
enclosures with associated RAID controllers and cabling. This combination of
components forms a high-performance, fully-redundant flash storage array.
The High Performance Flash Enclosure Gen2 pair contains the following hardware
components:
v Two 2U 24-slot SAS flash drive enclosures. Each of the two enclosures contains
the following components:
– Two power supplies with integrated cooling fans
– Two SAS Expander Modules with two SAS ports each
– One midplane or backplane for plugging components that provides
maintenance of flash drives, Expander Modules, and power supplies
v Two High Performance Flash Enclosure Gen2 flash RAID adapters configured
for redundant access to the 2U flash enclosures. Each RAID adapter supports
concurrent maintenance and includes the following components:
– High Performance ASIC RAID engine
– Four SAS ports and cables connected to the four SAS Expander Modules
providing fully-redundant access from each RAID adapter to both 2U
enclosures
– Integrated cooling
– x8 PCIe Gen2 cable port for direct connection to the I/O enclosure
Standard drive enclosures
The standard drive enclosure is a 2U storage enclosure that is installed in pairs.
Each standard drive enclosure contains the following hardware components:
v Up to 12 large-form factor (LFF), 3.5-inch drive enclosures
v Up to 24 small form factor (SFF), 2.5-inch SAS drives
Note: Drives can be disk drives or flash drives (also known as solid-state drives
or SSDs). You cannot intermix drives of different types in the same enclosure.
v Two power supplies with integrated cooling fans
v Two Fibre Channel interconnect cards that connect four Fibre Channel 8 Gbps
interfaces to a pair of device adapters or another standard drive enclosure.
v One back plane for plugging components
The 2.5-inch disk drives and flash drives (SSDs) are available in sets of 16 drives.
The 3.5-inch SAS disk drives are available in half-drive sets of eight drives.
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Chapter 1. Overview