IBM DS8880 Series Introduction And Planning Manual page 20

The first expansion frame supports up to 240 standard 2.5-inch disk drives. The
second expansion frame supports up to 336 2.5-inch standard disk drives. When all
three frames are installed, the DS8884 (models 984 and 84E) can support a total of
768 2.5-inch standard disk drives in a compact footprint, creating a high-density
storage system and preserving valuable floor space in data center environments.
Only the first expansion frame includes I/O enclosures. You can add up to one
High Performance Flash Enclosure Gen2 pair to the first expansion frame. The
second expansion frame does not include I/O enclosures or High Performance
Flash Enclosures Gen2.
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.
DS8884 (models 984 and 84E) expansion frame location options:
In addition to the standard expansion frame location, the DS8884 offers a remote
expansion frame option.
With the standard DS8884 expansion frame location, the first expansion frame is
located next to the base frame, and the second expansion frame is located next to
the first expansion frame.
A B C
Figure 2. DS8884 standard expansion frame locations
With the DS8884 remote expansion frame option, the first expansion frame is
located next to the base frame, and the second expansion frame can be located up
to 20 meters away from the first expansion frame. This option requires the
extended drive cable group C (feature code 1266).
Up to 20 M
A B C
Figure 3. DS8884 remote expansion frame option
DS8884F (machine type 533x model 984)
The DS8884F is an entry-level, high-performance, high-capacity storage system that
includes only High Performance Flash Enclosures Gen2.
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DS8880 Introduction and Planning Guide