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Chapter 3. Components overview
53
Figure 3-16 EXP400 back view
The EXP400 Expansion unit is available in 3 models:
1. 1733-1RU - comes with two 500-watt North America AC power supply with
fan units, one Enclosure Services Module (the second ESM is optional), a
filler panel to cover the empty ESM bay, and 14 drive filler panels.
2. 1733-1RX - same as 1733-1RU but with EMEA AC power.
3. 1733-2RX - comes with two -48 volt DC power supply with built-in fan units,
two ESMs, and 14 drive filler panels.
The IBM DS400 storage controller has two external SCSI connectors (see
Figure 3-14 on page 48) which can connect two optional EXP400 expansion
units allowing up to 7.8 TB (assuming 300 GB hard drives) of additional data.
When an EXP400 is attached to a DS400 with dual controllers, both EXP400
ESM boards must be connected to the DS400. It is important that the EXP400 be
connected to SCSI Expansion Channel 3 on both DS400 controllers, or to SCSI
Expansion Channel 4 on both DS400 controllers.
Note:
SCSI ID 6 (slot 7) must be left free in each EXP400 enclosure for SCSI
controller use. This means that only 13 drives can be installed in each
enclosure.
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